How to remove a virus, adware or spyware

If you suspect that your computer is not working right because of a virus or your antivirus program has even detected one, you should proceed to remove it from your system.
Back up your data first. Because you can't know from start what virus are you dealing with, the best thing to do is back up your important data to a CD, DVD or USB stick. After you've done disinfecting your computer, make sure you scan your backup removable media for viruses before you copy it back to the computer.
Update Antivirus as soon as you done backing up your data. If you don't have an antivirus program, go online and get a trial version. Personally, I prefer Kaspersky, but any other known antivirus that offer a trial, like Symantec's Norton Antivirus, McAfee or BitDefender will do. Even if you've just installed the antivirus program, your virus database is obsolete.
Some antivirus publishers offer online scanning tools free of charge. But be carefull to choose a legit and known site to do that. Don't google it and choose a pop-up that sais "Scan your computer free" because you may get another virus or malicios software.
Scan your computer. Open your antivirus application and start a deep system scan. Your antivirus will search into your operating system for programs that match virus signatures from it's database.
You can do anything else while scanning is made, just minimize the program and do your usual tasks. Scan times may vary from a few minutes to up to over a hour, depending on the computer being scanned.
After the scan has finished and results window has appeared, you are ready to remove the virus.
Antivirus programs can automatically remove minor threads and put the unwanted program or file in Quarantine. You can manually delete them from this "vault" where your antivirus puts them, depending of the program that you are using.
Adware and Spyware programs. Most antivirus publishers don't offer adware and spyware scan. If you've scanned your system and your antivirus has found nothing, you should try antiadware/spyware programs. You can try Lavasoft's Ad-Aware and AVG Antivirus for free.
If your problem could not be solved by antivirus programs or antiadware/spyware you should consider a fresh install of your operating system.