Some common and popular windows 7 problems :

1. Vista upgrade hangs at 62%
2. DVD drive not found
3. Aero isn't running
4. Aero Snap irritations
5. iPhone won't sync in Windows 7
6. Windows 7 themes change your custom icons
7. Taskbar problems
8. Missing Explorer folders
9. Missing applets
10. Too many minidumps
11. HP Multifunction Printer problems
12. Hidden extensions

Here,s the solution

http://www.techradar.com/news/software/ ... ved-646811