Has been found that 99% of the crashes are caused by ATI video card drivers.
If your client crashes on start do this :
1-UNINSTALL your current ATI driver
2-Go to this page (according to your Operating System)and download driver 11.5
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WINDOWS VISTA/7 - 32 bit
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WINDOWS VISTA/7 - 64 bit
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WINDOWS XP - 32 BIT
3-Install driver 11.5
4-install
THIS is you have a 32 bit Operating System OR install
THIS if you have a 64 bit Operating System