Your computer has been severely infected by malware, that is TWAIN.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 TWAIN.EXE as soon as possible.

Location : C:\Documents and Settings\UserName\Application Data\Twain\Twain.exe
Type : Malware
Dangerous : YES
Removal : Immediately

 
How to get rid of TWAIN.EXE