tool3.exe is known to be a type of adware. The appropriate way to fix this is to delete this file, after backing up your hard drive, and scanning for more viruses.

Spy Sheriff Malware is a type of malware, and tool3 is linked to it. Viruses and spyware can be very tricky. Malware creators know their files will be removed if found, so they sometimes give the files names that are similar to known essential files.

To be sure that you are not removing essential files, use Computer Associates's free scan of your hard drive.

With tool3.exe already on your hard drive, the chances that more malware or adware are still on your hard drive are pretty high. Using this free hard drive scanning toolis a good way to avoid any future problems with viruses and spyware.