
Quote: Originally Posted by
spiffman
Once you boot into the iso you can choose to format the drive during the windows 7 installation and it won't mess you up even if you're upgrading (note that the option to do this is available when the installer asks you which drive you want to install on - I believe you may have to click on a little button at that time that says show advanced options for it to appear). I did this upgrading from windows xp 32 -> windows 7 64.
Note that even if you don't format I think it's a "clean" install in the sense that windows 7 isn't relying on any of your old os files but you will have some remnants of your files stored in a windows.old folder that the install creates.
This is good to know because i did want to do a 'custom install' and let Windows 7 reformat the target drive before installing such that I get a true clean install. Some of the posts that said NOT to format the drive were not clear as to whether letting Windows 7 reformat as part of its clean install process would also cause problems.
One question, however. If you went from 32-Bit XP or 32-bit Vista and chose the
upgrade option after booting from the install DVD, would it still do some form of clean installation or would it attemp to leave your installed programs and settings intact?