I have windows vista and my computer keeps telling me I have been infected with spyware?

After It says I have been infected with spyware it gives me an option of downloading or buying software called pc antivirus and pc cleaner. Instead of downloading that I downloaded avg anti virus from a different website. I scaned my whole computer and deleted a bunch of stuff and quarinteened one thing. Not even 5 minutes after doing that it says I have been infected with spyware and gives me the potion of buying or downloading pc cleaner again. Iam not very computer literate and I need some advice on what to do

I have windows vista and my computer keeps telling me I have been infected with spyware?hijack this

They are trying to SELL you the software.

Install and run these, they will get rid of it and many others you don't even know are on your computer:::::::

FREE !!!!

Computer Maintenance

Advanced WindowsCare V2 Personal

http://www.iobit.com/advancedwindowscare...

CCleaner

http://www.ccleaner.com/

Spybot S%26D

%26gt;%26gt;...http://www.safer-networking.org/en/%26gt;...

Ad Aware 2007

http://www.lavasoft.com

Avira AntiVir庐 PersonalEdition Classic....

http://www.free-av.com/

I've been using them all for over a year now.

They are all compatible with each other and Windows XP and Vista as well as older versions of Windows.