Before upgrading which you should do and learn to maintain your computer on a regular basis.
Before you start restore your computer to when no errors there by using system restore by date.
If you are not using virus or male ware programs get one and use on regular basis updates etc.
Windows programs are good if kept up to date.
Defrag on regular basis and use disk clean up.
Use windows pop up blocker, Go to internet explorer home page, click tools at top of page, then internet options, then privacy tab, then sites, you can add there name, then block it.
Also you should have only 1 pop up blocker running. ie pop up blocker is excellent because you can change how it monitors the sights, medium, low or high. While you are there you can activate it.
Most people have problems because they do not maintain they just want to use it. Well its like a car, if you do not maintain it you have problems.
Malwarebytes Anti-Malware:
http://www.download.com/Malwarebytes-Ant...
Download, install, update and select Full Scan.
Remove all infections that it finds after scan.
Spyware Doctor Free Basic Edition - Realtime monitoring:
http://pack.google.com/intl/en/pack_inst...
Download install, update and run.
SUPERAntiSpyware Free Edition:
http://www.download.com/SUPERAntiSpyware...
Download, install, check for updates, then select Scan your Computer, select your drive and select Perform Complete Scan
SmitFraud Removal:
Firstly, download the removal tool from here:
http://siri.geekstogo.com/SmitfraudFix.p...
Then follow the instructions on the page
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remove MS Anti virus
The following free programs have high success rates in removing this parasite:
Malwarebytes Anti-Malware:
http://www.download.com/Malwarebytes-Ant...
Download, install, update and select Full Scan.
Remove all infections that it finds after scan.
SUPERAntiSpyware Free Edition:
http://www.download.com/SUPERAntiSpyware...
Download, install, check for updates, then select Scan your Computer, select your drive and select Perform Complete Scan
Spybot S&D:
http://www.safer-networking.org/en/downl...
Download, install, update and Immunize, turn off Tea Timer then click 'Check for problems' then when complete select all and then 'Fix Checked'
Open Spybot, click on Mode, select Advanced, click on Tools then Resident and untick Resident 'Tea Timer'
Do NOT untick Resident 'SD Helper' as that is your protection.
@ nevergrowup:
AVG and other antivirus programs will NOT remove this as it's a malicious codec. As for formatting.....no need.
Avast! Antivirus Home Edition [ http://avast.com/eng/avast_4_home.html ] offers realtime protection (which means it will warn you if a virus attempts to get into your computer) and is free.
Use an anti virus and male ware program these are a few.