Did you reformat and reinstall the operating system and all programs? Or did you reinstall the operating system over the top of the previous version? Or did you do "System Restore" while in Windows by clicking on Start-All Programs-Accessories-System Tools-System Restore, then "restore my computer to an earlier time".

Either of the last two will simply go back to an earlier time and may only fix "some" of the problems files. The reformat and reinstall option should wipe everything clean and should give you all options and wizards that came with the computer. If you did the reformat and reinstall, did you reinstall all hardware drivers, specifically any mouse software? Have you reinstalled the camera software as well?

Hope this helps and let us know more.

Grif