So, you've got a big blank space in Add/Remove Programs? Lets fix it.

Click Start then click run and type

navigate to "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall"

Click Edit then in the "find" field type

On your keyboard hit F3 (find next) untill you see an entry with ",-1" at the end of it.
Delete ",-1"

go to Add/Remove Programs. If you already have it open, close & re-open it. If it is still messed up, repeat the steps above, there may be more than one error.