I have changed my BIOS instead of updating it due to some misunderstanding. But now when I installed windoes 7 32 bit, SATA_Intel_ICH9_v126.96.36.1993_Win7x86x64 driver is not installing, says "The System does not meet the minimum requirements" and I have core2duo processor with Intel GMA 4500MHD accelerator. Is Really this problem occured due to change of my BIOS.If yes, can I now change my BIOS (will It affect my Laptop in anyway??).
The BIOS version you need is dependent on the laptop, not the processor. Check with your laptop vendor, and see if you really need that Intel driver. You might not.