Your computer has been severely infected by malware, that is 6_LDR.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 6_LDR.EXE as soon as possible.

Location : C:\Documents and Settings\UserName\Local Settings\Temp\6_ldr.exe
Type : Malware
Dangerous : YES
Removal : Immediately

 
How to get rid of 6_LDR.EXE