If you are talking about pop-up ads, then make sure Pop-up Blocker is enabled (Tools > Pop-up Blocker > Turn on Pop-up Blocker). There are also settings to add sites that you want to allow pop-ups on, such as your bank or bill-paying sites.
If you're talking about the imbedded ads in web sites that activate when rolled over, there's not much that can be done about that except practice careful mousing :-)
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