Advertisements keep appearing on the top right corner of my desktop screen. How do I get rid of it?

Answer 1

free scan and free removal from Microsoft
http://safety.live.com/site/en-us/default.htm?s_cid=sah

Answer 2

Your PC is infected with adware. Use these scans to remove it.

All of these are ones that I personally use and all are free.

AVG Removes I-Worm/Stration · BackDoor.Generic3.GBB and .GBC · Worm/Generic.FX · Exploit.WMF
http://free.grisoft.com/doc/5390/lng/us/tpl/v5

Spybot - Search & Destroy detects and removes spyware, a relatively new kind of threat not yet covered by common anti-virus applications. Spyware silently tracks your surfing behaviour to create a marketing profile for you that is transmitted without your knowledge to the compilers and sold to advertising companies. If you see new toolbars in your Internet Explorer that you haven't intentionally installed, if your browser crashes inexplicably, or if your home page has been "hijacked" (or changed without your knowledge), your computer is most probably infected with spyware. Even if you don't see the symptoms, your computer may be infected, because more and more spyware is emerging. Spybot-S&D is free, so there's no harm giving it a try to see if something has invaded your computer.
http://www.safer-networking.org/

http://superantispyware.com/
SUPERAntiSpyware is the most thorough scanner on the market. Our Multi-Dimensional Scanning and Process Interrogation Technology will detect spyware that other products miss! SUPERAntiSpyware will remove ALL the Spyware, NOT just the easy ones!
Easily remove over 100,000 pests such as SmitFraud, Vundo, WinFixer, SpyAxe, SpyFalcon, WinAntiVirus, AntiVermins and thousands more!
Make sure after you download any of these, that you update them.

*Be sure to come back to Yahoo Q&A and vote for one of the answers as best answe

Answer 3

Get Windows Defender. Its free, and works. Gets rid of spyware/adware and keeps your system clean:

http://www.microsoft.com/athome/security/spyware/software/default.mspx

You typically get spyware/adware when you use P2P applications to download programs.

Answer 4

You have spyware or adware on your computer. Use a program like Adware to search and destroy all your adware on your computer.

Here is a free download link:

http://www.download.com/Ad-Aware-SE-Personal-Edition/3000-8022_4-10045910.html?part=dl-ad-aware&subj=dl&tag=top5