When i open the add and remove program nothing shows up.
Check this Microsoft knowledge base article: http://support.microsoft.com/kb/247515
Perhaps one of the entries is longer than 60 characters.
I once had this exact same problem years ago. At least in my case i found the uninstaller data had been deleted from the registry. Look for HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall
For my case, it also happened on a disk drive i had just imaged so i was able to recreate the problem and able to recreate the problem at will to determine with 100% what was the cause!! It happened when I uninstalled Yahoo Browser Services. Intereseting that when i posted what i found, someone replied about 2 weeks later they had same problem and had just uninstalled yahoo.
any chance you chanced uninstalled yahoo?? would be interesting if years later they repeated the same bug
Excuse the double post.. but just to make sure you see this...
If you find the registry data IS missing do a System Restore to an earlier date