I have a desktop system that had WinXP on it. I bought a copy of Win7, put the install CD in the drive, and booted. After waiting a long time(*), it finally booted and offered me a choice:
Upgrade
Complete install
I'd swear I chose fresh install, but when it finished installing all my user...
64-bit issues
admin account
backup solutions
data migration
desktop system
external storage
file access
file ownership
fresh install
installation issues
permission errors
registry problems
reinstallingos
system issues
system recovery
upgrade
user accounts
user management
user permissions
windows 7