So my computer has been freezing when doing stuff it should easily be able to handle. For example, I try running Photoshop CS3 and Firefox at the same time and it will act slow and sluggish. Not just photoshop, lots of other applications are slow. Basically, my performance is terrible. I just got my computer so I doubt it's a virus or anything (I'm very careful anyway and I've ran a virus scan). I've downloaded Speedfan and this is my results:

So apparently two of my fans aren't running which can't be good. And that fire symbol I assume means the temperature is too hot.
Any idea how to cool my computer/get the fans running?
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System Information
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Time of this report: 10/3/2008, 08:03:35
Machine name: IAN-B0A895F3472
Operating System: Windows XP Home Edition (5.1, Build 2600) Service Pack 3 (2600.xpsp.080413-2111)
Language: English (Regional Setting: English)
System Manufacturer: System manufacturer
System Model: System Product Name
BIOS: BIOS Date: 03/20/08 Ver: 08.00.14
Processor: AMD Phenom 9850 Quad-Core Processor, MMX, 3DNow (4 CPUs), ~2.5GHz
Memory: 3328MB RAM
Page File: 615MB used, 4596MB available
Windows Dir: C:\WINDOWS
DirectX Version: DirectX 9.0c (4.09.0000.0904)
DX Setup Parameters: Not found
DxDiag Version: 5.03.2600.5512 32bit Unicode
Card name: ATI Radeon HD 4800 Series