Hi, Let me start with an apology as when I'm brand new to forums I usually get all etiquette completely wrong. I have a new computer (my technical lingo isnt all that great). It doesnt work correctly... the problem is it spontaneously freezes when doing anything from downloading a simple file to running a game this can happen anywhere between 30 minutes to 2 hours of use. When it freezes the sound "jitters" too. Not sure what spec I should put but here I go: Mobo: nForce 650i SLI ASUS P5N-E SLI DUAL PCI-Express CPU : INTEL Core2Quad Q6600 1066Mhz FSB/8MB L2 Cache 4 x Kentsfield Cores @ 2.4Ghz = 9.6Ghz RAM : 4GB DDR2 800Mhz PC6400 Unbuffered, Non-Ecc, 64*8 HD : MAXTOR 500GB Serial ATA 2.0 With 16MB Cache PSU : 600 watt Winpower GPU : 2 x nVidia 8500GT 512MB Both SLI PCI-E Cards With 16 Stream Processors 16X PCI-E, DirectX10 & Pixel Shader 4 OS : Windows XP Pro SP2 I have fully updated all drivers and BIOS and am positive they are all correct and fully compatible I have also ran hardware stability and compatability checks which all come up fine. Temperature is also normal. If anyone can help me understand my problem and solve it I would be really grateful. Let me know if you need anymore tech specs and I will try to find them out. Cheers.