You have several choices. My first suggestion is to download the latest version of Mozilla, it's a super great browser,free no ads, and you can set the level of pop-up blocker you want. Go to Mozilla.org and download version 1.6. Open source sotware developed by computer enthusiasts and is based loosley on the old but great Netscape browser.
Google's also a good choice, and I think the latest version of Windows Exploer has one. Also almost every major portal (Yahoo, Aol etc.) now provides one.
The other thing to check is for a virus, update your virus definitons and run a scan. Also a spybot can really slow down a computer. Download and run
Lavasoft Adaware 6.0 www.lavasoft.com (free no ads). Finally, if you're running Wndows XP enable the firewall,even if you have dialup. If you don't know how to do this pm me and I'll walk you through it.
One other thing and this is for everybody on the Forum suffering from spam.
Download SpamPal(free no ads) and the Help section to go with it(two seperate downloads). SpamPal's a little tricky to configure but once it's up and
running it will drop about 97% of spam into a seperate folder. I've been using it for about three months and it has caught over 3,500 pieces of spam!