Download any of the System Rescue tools using a clean computer:

VIPRE Rescue
http://live.sunbeltsoftware.com/
Avira AntiVir Rescue System
http://www.free-av.com/en/products/12/avira_antivir_rescue_system.html
Kaspersky Rescue Disk
http://support.kaspersky.com/faq/?qid=208282173
BitDefender Rescue CD
http://download.bitdefender.com/rescue_cd/
F-Secure Rescue CD
http://www.f-secure.com/en_EMEA/security/tools/rescue-cd/
Dr.Web LiveCD
http://www.freedrweb.com/livecd/

You need to burn the file in a blank disc and use to boot the computer. It will scan the computer before Windows logon which means the rogue program or any malware will be removed, if found by the scanner.