Download my userinit fix from here
http://www.ms-mvp.org/ this file works
for SP2 and SP3 only. READ the enclosed instructions. If you have SP1 do not
use this file. If you need any other version then email me using the link at
the bottom of my webpage. Your issue is caused by a malware infestation.
Once fixed you will need to use my Remove-it software, it will remove that
malware from your system. Choose yes for all options when prompted. Download
it here
http://www.ms-mvp.org/