I see threads fairly frequently (maybe not here) about people who believe they are infected but have no idea what to do, so I'm creating this thread with Reality's help for people to be able to have a reference point to go to if they ever believe they are infected.
Step 1
Update your Antivirus software and run a scan. Most people never consider this option and jump right into "panic mode" if they believe they have an infection of some kind. In most cases a simple scan with an AV can knock out almost any problem.Step 2
Still think you have an infection? Download Malwarebytes Anti-Malware, update the program and run a Full Scan. Remove anything it finds.Step 3
If you believe the virus is FUD, because the scans have both came up clean but you are having issues like a cursor moving on it's own or passwords getting changed, download ATF-Cleaner and use it to clean out your temp folder. FUD viruses tend to drop themselves in the temp file, which isn't always the case though. Step 4
As a last resort, if you have a detectable virus that you cannot remove or a FUD virus follow these instructions and post the required logs in the Virus Removal section. A trained helper will check your logs and help you remove any viruses that you may have.