What is Tagasaurus?

It just popped up into my desktop today and then pop ups kept on coming and slowing my system. How did it come onto my desktop. BTW, after I saw it I used system restore and almost everything looks like it used too. I have a Win A $1000 icon on my desktop but I deleted it.

Probably just adware.
http://www.lavasoft.com
http://www.spybot.info/

Try those two programs out, hopefully they should be able to remove them.

Make sure you run them in safe mode to get as much as possible, too.