Your computer has been severely infected by malware, that is DFUNINSTALL.EXE. This is quite dangerous and unsafe for your PC and there may be other infections on your PC. You should urgently check your PC and remove any malicious application including DFUNINSTALL.EXE as soon as possible.

Location : C:\Documents and Settings\[username]\Local Settings\Temp\DFUninstall.exe
Type : Malware
Dangerous : YES
Removal : Immediately

 
How to get rid of DFUNINSTALL.EXE