Help, my PC has started freezing up. Mouse/keyboard stop responding. H

Help, my PC has started freezing up. Mouse/keyboard stop responding. Have to restart.
I'm using Vista Ultimate 64, I had installed updates earlier today and tried adding another hard drive through disk management and then things start freezing when I tried installing a game on the new drive. I've done system restore, uninstalled the windows updates that had installed today and removed the new hard drive from disk management. It is once again unallocated. But my PC still freezes up shortly after being on for a while. I tried unplugging and plugging back in the usbs, no help. What should I do? it worked fine yesterday. My I think my bios version is 1504.

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HIS H587F1GDG Radeon HD 5870 (Cypress XT) 1GB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card w/ATI Eyefinity

NZXT SEN-001LX Sentry LX Aluminum dual bay fan controller

LG Black 8X BD-ROM 16X DVD-ROM 40X CD-ROM SATA Internal Combo LG Blu-ray Reader & 16X LightScribe DVD±R DVD Burner

Western Digital VelociRaptor WD3000HLFS 300GB 10000 RPM 16MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive

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More about help started freezing mouse keyboard stop responding
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  3. No help.
  4. where did u get buy your computer?
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