Keep getting pop ups for spyware,adware and ucleaner..why?

Whenever I turn on my dell laptop, message windows start popping up saying that Windows IE (Internet Explorer) has detected adware, spyware and it's infecting my computer and to click OK to clean my computer. I usually just close the window but IE opens up with an advertisement from Ucleaner and it won't go away. I can't use my laptop because there are so many pop-ups it's impossible. I see icons on my desktop, that I didn't install, such as Error Cleaner and Adware%26Spyware Protection but when I go to control panel and try to uninstall them they aren't on the list. And now my lap top is getting really slow. I've realized that I haven't defrag my lap top in over a year, will this work?

Please help.

Keep getting pop ups for spyware,adware and ucleaner..why?internet security 2006

Try some of these. This is a list I have compiled of what I feel are the best free-anti-spyware/anti-malware websites. When I use them together on my system it does an excellent job in keeping it clean.

Advanced Windows Care http://www.iobit.com/advancedwindowscare...

Ad-Aware 2007

http://www.lavasoft.com/products/ad_awar...

Advanced Spyware Remover

http://www.evonsoft.com/Download.htm

EMCO Malware Destroyer

http://www.tucows.com/preview/414285

Malware Sweeper

http://www.malwaresweeper.com/download.h...