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Check for malware / viruses using Malwarebytes Antimalware and AVAST. Check MSCONFIG for startup items. Remove any program you don;t use. Post results here
Most anti-virus programs will auto-update once a day, or week, or some other period of time. However, if it's a manual update, then there are a few pages you could go to:
Norton Anti-Virus: http://updatecenter.norton.com//ManualUpdate?NUCSID=81&NUCVER=2&NUCLANG=zh_tw
CA: http://www.ca.com/us/support/gsa/Virus-Info/Virus-Signature-Updates.aspx
Avast!: (right-click on the Avast! icon in the bottom right corner of your screen, you might need to expand the system tray by clicking the triangle, highlight update, and update both options.)
AVG: (Same as Avast!)
As I said before, most anti-virus programs will auto-update.
I hope this helps!
If it is a bad virus that won't let you do anything on the computer, follow the instructions on this link. If you can install programs on your computer, follow only steps 7 and 8 from that link.
Update your antivirus program if an update wasn't performed during the install or you didn't have an Internet connection available to you during the installation.
Update your virus definitions, the "signatures" that identify known viruses. When you buy your antivirus program, you'll receive a subscription for an update service which will allow you to download any new virus definitions. The update subscription is often for a year, so eventually you'll have to purchase a new subscription.
Upgrade your antivirus program. Antivirus companies release new versions of their software every few years. The new version will have features not available in your current system. Purchase these new upgraded programs and you'll have the latest features, enhanced virus protection and a fresh subscription for virus definition updates.
Maintain your antivirus software by scheduling automatic updates. If you rely on manual updates, you can easily forget to perform them and your virus definitions can fall behind
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