I would suggest you download and run hijackthis from, for example,
http://www.download.com/HijackThis/3...-10379544.html (there's a sticky at the top of this forum)
This will produce a report which should include the website you mention - if you see it in the list delete it (this will remove it from the registry) and restart the PC (or post the output for further assistance [but use the 'disable smilies in post' feature if you do]).
I would also recommend you run spybot search and destroy instead of adaware (but do not install the Internet Explorer immunisation feature as it tends to slow everything down).
hth
amofw