Lots of games crashing...help!

Ive been suffering crashes a lot lately, it all started with STALKER (which is not on my PC anymore), but shortly after that, SupCom suffered freezes at regular points in the campaign map, then LOTR constantly "needed to close, send/dont send etc." Now, im getting crashes on Zombie Master/CSS where it just locks up with jittery sound. I never suffered probs like this before, but my hard drive is very full as of late? Could that be it? Ive tried everything I usually try to fix games, drivers, firewalls/anti viruses disabled etc, lowering graphics settings, nothing seems to work. Here is my DxDiag, its getting beyond tolerable cos it seems I cant enjoy a game without it screwing up  in one way or another, can anyone help?

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System Information
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Time of this report: 6/7/2007, 18:05:17
       Machine name: PC-YE06R3F5SCKJ
   Operating System: Windows XP Professional (5.1, Build 2600) Service Pack 2 (2600.xpsp_sp2_gdr.070227-2254)
           Language: English (Regional Setting: English)
System Manufacturer: System manufacturer
       System Model: System Product Name
               BIOS: BIOS Date: 11/01/06 19:00:34 Ver: 08.00.12
          Processor: Intel(R) Pentium(R) D CPU 3.40GHz (2 CPUs)
             Memory: 1024MB RAM
          Page File: 446MB used, 2381MB available
        Windows Dir: C:WINDOWS
    DirectX Version: DirectX 9.0c (4.09.0000.0904)
DX Setup Parameters: Not found
     DxDiag Version: 5.03.2600.2180 32bit Unicode

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DxDiag Notes
------------
  DirectX Files Tab: No problems found.
      Display Tab 1: No problems found.
        Sound Tab 1: No problems found.
        Sound Tab 2: No problems found.
          Music Tab: No problems found.
          Input Tab: No problems found.
        Network Tab: No problems found.

--------------------
DirectX Debug Levels
--------------------
Direct3D:    0/4 (n/a)
DirectDraw:  0/4 (retail)
DirectInput: 0/5 (n/a)
DirectMusic: 0/5 (n/a)
DirectPlay:  0/9 (retail)
DirectSound: 0/5 (retail)
DirectShow:  0/6 (retail)

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Display Devices
---------------
        Card name: Radeon X1600 Series
     Manufacturer: ATI Technologies Inc.
        Chip type: ATI Radeon Graphics Processor AGP (0x71C2)
         DAC type: Internal DAC(400MHz)
       Device Key: EnumPCIVEN_1002&DEV_71C2&SUBSYS_215C17AF&REV_00
   Display Memory: 512.0 MB
     Current Mode: 1024 x 768 (32 bit) (75Hz)
          Monitor: Plug and Play Monitor
  Monitor Max Res: 1600,1200
      Driver Name: ati2dvag.dll
   Driver Version: 6.14.0010.6698 (English)
      DDI Version: 9 (or higher)
Driver Attributes: Final Retail
 Driver Date/Size: 5/18/2007 02:57:53, 268288 bytes
      WHQL Logo'd: n/a
  WHQL Date Stamp: n/a
              VDD: n/a
         Mini VDD: ati2mtag.sys
    Mini VDD Date: 5/18/2007 02:57:34, 2164736 bytes
Device Identifier: {D7B71EE2-3282-11CF-356E-5601A1C2CB35}
        Vendor ID: 0x1002
        Device ID: 0x71C2
        SubSys ID: 0x215C17AF
      Revision ID: 0x0000
      Revision ID: 0x0000
      Video Accel: ModeMPEG2_C ModeMPEG2_D ModeWMV8_B ModeWMV8_A ModeWMV9_B ModeWMV9_A
 Deinterlace Caps: {6E8329FF-B642-418B-BCF0-BCB6591E255F}: Format(In/Out)=(YUY2,YUY2) Frames(Prev/Fwd/Back)=(0,0,1) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive
                   {335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(YUY2,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalStretch
                   {3C5323C1-6FB7-44F5-9081-056BF2EE449D}: Format(In/Out)=(NV12,0x3231564e) Frames(Prev/Fwd/Back)=(0,0,2) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive
                   {552C0DAD-CCBC-420B-83C8-74943CF9F1A6}: Format(In/Out)=(NV12,0x3231564e) Frames(Prev/Fwd/Back)=(0,0,2) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive
                   {6E8329FF-B642-418B-BCF0-BCB6591E255F}: Format(In/Out)=(NV12,0x3231564e) Frames(Prev/Fwd/Back)=(0,0,1) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive
                   {335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(NV12,0x3231564e) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalStretch
         Registry: OK
     DDraw Status: Enabled
       D3D Status: Enabled
       AGP Status: Enabled
DDraw Test Result: Not run
 D3D7 Test Result: Not run
 D3D8 Test Result: Not run
 D3D9 Test Result: Not run

-------------
Sound Devices
-------------
            Description: C-Media Wave Device
 Default Sound Playback: Yes
 Default Voice Playback: Yes
            Hardware ID: PCIVEN_13F6&DEV_0111&SUBSYS_011113F6&REV_10
        Manufacturer ID: 1
             Product ID: 100
                   Type: WDM
            Driver Name: cmaudio.sys
         Driver Version: 5.12.0001.0643 (English)
      Driver Attributes: Final Debug
            WHQL Logo'd: n/a
          Date and Size: 11/18/2002 16:51:40, 377358 bytes
            Other Files:
        Driver Provider: C-Media
         HW Accel Level: Full
              Cap Flags: 0x0
    Min/Max Sample Rate: 0, 0
Static/Strm HW Mix Bufs: 0, 0
 Static/Strm HW 3D Bufs: 0, 0
              HW Memory: 0
       Voice Management: No
 EAX(tm) 2.0 Listen/Src: Yes, Yes
   I3DL2(tm) Listen/Src: Yes, Yes
Sensaura(tm) ZoomFX(tm): Yes
               Registry: OK
      Sound Test Result: Not run

            Description: Realtek AC97 Audio
 Default Sound Playback: No
 Default Voice Playback: No
            Hardware ID: PCIVEN_1106&DEV_3059&SUBSYS_81B91043&REV_70
        Manufacturer ID: 1
             Product ID: 100
                   Type: WDM
            Driver Name: ALCXWDM.SYS
         Driver Version: 5.10.0000.5930 (English)
      Driver Attributes: Final Retail
            WHQL Logo'd: n/a
          Date and Size: 9/22/2005 17:34:18, 3727680 bytes
            Other Files:
        Driver Provider: Realtek Semiconductor Corp.
         HW Accel Level: Full
              Cap Flags: 0x0
    Min/Max Sample Rate: 0, 0
Static/Strm HW Mix Bufs: 0, 0
 Static/Strm HW 3D Bufs: 0, 0
              HW Memory: 0
       Voice Management: No
 EAX(tm) 2.0 Listen/Src: Yes, Yes
   I3DL2(tm) Listen/Src: Yes, Yes
Sensaura(tm) ZoomFX(tm): No
               Registry: OK
      Sound Test Result: Not run

---------------------
Sound Capture Devices
---------------------
            Description: C-Media Wave Device
  Default Sound Capture: Yes
  Default Voice Capture: Yes
            Driver Name: cmaudio.sys
         Driver Version: 5.12.0001.0643 (English)
      Driver Attributes: Final Debug
          Date and Size: 11/18/2002 16:51:40, 377358 bytes
              Cap Flags: 0x0
           Format Flags: 0x0

            Description: Realtek AC97 Audio
  Default Sound Capture: No
  Default Voice Capture: No
            Driver Name: ALCXWDM.SYS
         Driver Version: 5.10.0000.5930 (English)
      Driver Attributes: Final Retail
          Date and Size: 9/22/2005 17:34:18, 3727680 bytes
              Cap Flags: 0x0
           Format Flags: 0x0

-----------
DirectMusic
-----------
        DLS Path: C:WINDOWSSYSTEM32driversGM.DLS
     DLS Version: 1.00.0016.0002
    Acceleration: n/a
           Ports: Microsoft Synthesizer, Software (Not Kernel Mode), Output, DLS, Internal, Default Port
                  Realtek AC97 Audio, Software (Kernel Mode), Output, DLS, Internal
                  MPU-401, Hardware (Kernel Mode), Input, No DLS, External
                  MPU-401, Hardware (Kernel Mode), Output, No DLS, External
                  C-Media Wave Device, Software (Kernel Mode), Output, DLS, Internal
                  Microsoft MIDI Mapper [Emulated], Hardware (Not Kernel Mode), Output, No DLS, Internal
                  Microsoft GS Wavetable SW Synth [Emulated], Hardware (Not Kernel Mode), Output, No DLS, Internal
                  MPU-401 [Emulated], Hardware (Not Kernel Mode), Output, No DLS, External
                  MPU-401 [Emulated], Hardware (Not Kernel Mode), Input, No DLS, External
        Registry: OK
     Test Result: Not run

it may be a heat issue. try cleaning out all of the dust in your PC and if you have anything overclocked, set it back to stock settings.CYSYKO