well ill do a clean install anyway but i just want to make sure i can still do the upgrade.

Hi im upgrading most of the components in my pc but im wondering if my current power supply (Antec Earthwatts 430) would work fine. Heres my new system specs. My current PSU has two 12V rails with a combined max load of 30A

MSI 790GX-G65

Sapphire Vapor-X Radeon HD 4870

AMD Phenom X2 550

Crucial Ballistix 4GB ddr3 1333

Can I still use the upgrade with my dell oem copy of windows, or would I need to have a retail version of windows?

Can you boot into windows safe mode, and did you install the new nvidia drivers for that card? Also, make sure your monitor isnt plugged into your motherboard graphics.

There are two hard drives im looking at and i just wanted to get your opinions on each of them. The main thing that im trying to decide is whether the 32mb cache is going to make that much of a difference than a 16mb cache.

The samsung one is here

The Seagate one is here