Have you sought assistance from your antimalware provider (Avast, AVG, Avira, McAfee, Norton, Trend Micro, etc)?
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An easier solution than using an offline scan is to use HitmanPro Kickstart which should remove this malware and repair the changes made to the computer by the malware: http://www.surfright.nl/en/kickstart You must use an uninfected computer to download it to a flash drive and then follow the specific directions on how to run the program on the infected computer. Hitman Pro Kickstart is available as a 30 day trial version. We have received feedback in the forum for months confirming that HPK will remove Sirefef.
For further information see http://dl.surfright.nl/Kickstart-FAQ.pdf and http://dl.surfright.nl/Kickstart-User-Manual.pdf
Windows 7 live cd iso shared files: Here you can download windows 7 live cd iso shared files that we have found in our database. Just click desired file title and download link will show up!
If you prefer to do so you can use one or more of the following offline scanners - you'll need to burn a CD using a different computer and change the boot sequence on your computer to run the scan - instructions are included with the links:
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Good luck...