Pop ups + unable to download spybot etc

  Sky Gazer. 03:57 16 Sep 05

I am a novice PC user, I have windows xp and norton security 2005.
I accidently clicked onto what I now beleive to be a "dodgy" website as what happened was a pop up appeared asking if I wanted to download some microsoft software the only box you could click was yes, which I ignored and I closed the ad by clicking on the red x in the top right corner. Since then I have had annoying pop-ups some of which advertise porn sites.I tried to download ad-aware but I heard a bleep and nothing happened. I downloaded spybot but in order to use it I have to first download the update and again it will not work. I have had pop-ups from norton advising it has picked up suspicious soft ware activity but Im still getting these pop-up ads.
I think my PC is infected with software/spyware that is causing these pop-ups. Incidentally it "crashes" every time I try to launch spybot.
Any help appreciated - thanks

  Sky Gazer. 04:21 16 Sep 05

also forgot to mention when I go online my browser home page has "about blank" which features a search page - need to get rid of this as well -thanks

  Sky Gazer. 22:26 16 Sep 05

Hi - I looked up other threads relating to about blank and pop up ads - took the advice regarding getting rid of spyware and downloaded some good software such as ad-aware, spyware blaster etc, and problem now seems to be resolved - thanks for all the good info on here -

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