Do the following step and get rid of it.
Open Run , type regedit and press enter
Go to
HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ Windows NT \ CurrentVersion \ Winlogon
and check for the key Shell, the value of this must be Explorer.exe . if you can see some other after that like Explorer.exe C:\PROGRA~1\MYWEBS~1\bar\2.bin... , then remove the second file from the value, means it must only Explorer.exe
Ok, then check for the key Userinit. the value must be C:\WINDOWS\system32\userinit.exe, (including the comma) . If after that some thing is there , then delete it.
Ok thats all. restart your system .