Windows 7 not installing

#1
Everytime I try to install it, BSOD appears at some point or another during the procedure, it is a different error message everytime, and I have tried both 32 bit and 64 bit versions. I am currently running XP, have 4GB RAM, 500GB, a Gigabyte GA-MA74GM-S3, An AMD Phenom II quad core X2 940 processor, and ATI Radeon 4870. The drivers have been installed, and we have used several different disks to install with. What could be the problem? If it helps, this is the most common one: IRQL_NOT_LESS_OR_EQUAL.
 


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