You can download a free pop-up stopper program from here
Jaytree - if it's just the one site causing you problems you could also try this, which is a slightly more technical solution.
Depending upon which operating system you have on your PC try to locate the "hosts" file. This should be at:
Windows 95/98/Me c:\windows\hosts
Windows NT/2000/XP Pro c:\winnt\system32\drivers\etc\hosts
Windows XP Home c:\windows\system32\drivers\etc\hosts
It is possible that this file will not exist - it doesn't matter, you can create one using notepad.
Either creating a new file, or editing the existing one, make sure you have a line which reads (without the quotes)
"127.0.0.1 localhost"
below that add a line which reads
"0.0.0.0 ads.adviva.net"
Save the file, and it should get rid of the popups (you may see a file not found message instead in some circumstances). There's more information about how this works here , and a much longer list of advert sites you might also want to block here .