Hi,
1) run SDFIX ( winXP ONLY, skip when using Vista or 7 )
First download SDFIX here
http://www.bleepingcomputer.com/files/sdfix.php
Then start your PC in safe mode and run it.
2) run COMBOFIX
Download & Run COMBOFIX
http://www.bleepingcomputer.com/comb...o-use-combofix
3) scan with MALWAREBYTES, SUPER ANTI SPYWARE & TROJAN REMOVER
http://www.malwarebytes.org/
http://www.superantispyware.com/
http://www.simplysup.com/
4) clean up the rest with HIJACKTHIS
http://free.antivirus.com/hijackthis/
with hijackthis you can check your startup services, processes and clean up any suspicious stuff you see there. ( note: make a backup of your windows register first )
There you go, follow these steps and you're popup free again
