Old HDD's into new case - question

I got a new rig recently (specs in the sig). My current 750 GB HDD works fine, I have Vista 64 bit on it. But I want to use my other two hard drives, one of which has my old Windows Vista 32 bit (I didn't upgrade from 32-64, just got a new one). I want to be able to get my hard drives in my new rig, but without losing any of the memory of them by formatting the drives. Is there a way possible? I haven't totally experimented, one because I'm a newb at hard drives and two because I don't want to bother risking anything where I have no knowledge in...

Thanks in advance GS guys (and girls).

the drives will work fine but windows may or may not boot. If all your data is on the c drive and windows fails to boot you will probably loose it. if it is on any other partition it will be fine even if you reload windows. If you still have your old system, uninstall all the drivers then windows should boot fine on a new system. imprezawrx500

Yeh change it too some different letter, and make sure you set the HDD as a slave, not master, otherwise you will get conflicting drivers/programs.

You can add is as many drives as your motherboard has connections for and read/write data just fine without needing to format. Just don't expect to boot the old OSes on them UNLESS they were all originally loaded on your current rig. And be sure your BIOS still has your 750GB HDD as the main boot device.