What is the difference between Windows 7 x86 and Windows 7 x64?

I had Windows XP 32 bit installed in my PC but recently I formatted it and installed Windows 7 x64 in it now the problem is Windows 7 x64 is not installing or you can say not supporting the audio drivers and also not supporting some softwares I had earlier. I want to know why is that happening ? And also what is... show more I had Windows XP 32 bit installed in my PC but recently I formatted it and installed Windows 7 x64 in it now the problem is Windows 7 x64 is not installing or you can say not supporting the audio drivers and also not supporting some softwares I had earlier. I want to know why is that happening ? And also what is the difference between x64 and x86 I read somewhere that x86 is a 32 bit OS is it true please answer thanks
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