Most 32-bit Windows software can run flawlessly under 64-bit versions of Windows, so you can continue using most of the applications you already have. Those that have 64-bit versions usually list both on download.com, letting you choose which to download/install. (Just search for the name of the program to see all available versions.) While searching, as a general rule, the programs are designed for Windows x86 and compatible with Windows x64 unless otherwise stated.
Hope this helps,
I am planning to build a new computer tomorrow and am planning to instal Windows 7 Home Premium 64-bit on it. I have checked the Windows 7 compatibility site and found that all my hardware is compatible with 64-bit.
Now coming to the software part, I usually download most of my softwares from download.com. Now my question is that if I want the 64-bit version of the software, how can I download it from download.com. I have found many softwares which in the same version supports both 32bit and 64bit. But what about the softwares which have different versions for 32 bit and 64bit?