Window 7 x86 vs Window 7 x64?

What's the difference between the two???

Win7 64bit has a file titled "Program Files (x86) " this is for when you install 32bit program and where it is installed into. So you can use most 32bit programs in a 64bit sys...so all x86 refers to is 32bit programs..I can't say as I have noticed Win7 x86 titled as such but all it would mean is a 32bit sys...Hope this helps..

There's an article on that very topic right here which explains the difference:

Windows 7: 64 bit vs 32 bit?

If you're got any specific questions about it, feel free to ask!

Why does it call it X-86 rather than x-32?

My guess would be from the old computers number system (286, 386, 486). The first Pentium was in the 586 series if I remember correctly. If you notice the first number is the only difference therefore making them all in the x86 class.

Because today's architecture is built on the Intel 8086 instruction set, and further derivatives of that have become x86.

how can I use 32 bit program like SAP on 64 bit. I am using window 7 enterprise 64 bit. please help

Have you tried installing it to see if it works?

Nearly all 32-bit software will run on a Windows 7 x64 system.