I have Win Vista 32 bit system and I want to know if I can install Win 7 64 bit system without doing the so called "clean install". I know if I go from my 32 bit to Win 7 32 bit is a very seamless upgrade, but the change to 64 bit is confusing for me. Thanks!!
You cannot upgrade from a 32-bit installation to a 64-bit installation without doing a clean install. This is probably due to the fact that things are organized slightly differently on the 64-bit version of Windows (it has two Program Files folders, etc.). Here's a guide to the types of upgrades that can be done:
No. If you upgrade, you will have to do a full format and install.
Check into Windows "Easy Transfer" to help ease the pain.
This post by Scott Hanselman details more about the process and options.