Quite often antivirus scanner locate a virus, quarantine it than you find that the next day it's back again. What happened is that windows have included the viruses into the system restore point when it creates one. The folder that contains the restore point information is the "System volume information" folder this is a protected folder.

You may be able to see the folder at all. There are two methods of ridding yourself of the virus if the scanner is incapable. Both require you to be logged on as an administrator.
First method:

The first method is to remove all the restore points. Unless you are 100% sure you will never need to restore to a previous point then by all means do it.

         1. Right click on my computer then click on system restore tab. Place a check mark alongside "Turnoff system restore on all drives" click Ok and close the dialog boxes.
         2. Run your antivirus scanner again to make sure the virus is gone. You can choose to perform the task you can do only in the folder where virus is detected. In this case “System Volume information” Folder.
         3. Once your are happy return to System Restore tab and uncheck the mark while you are there highlighted the drives, click Settings and slide the slider to the left to around 2%. This will release a significant amount of hard drive space. Windows default setting is to reserve 12% and on a 150 gig drive that can total 18 gigabytes. 2% will still give you enough room for an ample number of restore points. Click OK and close the dialog boxes.
        4. Next, Create a new restore point. With any name you want.

Second method is coming soon ;)