check your firewall and antivirus settings
Internet Explorer problems and errors can ruin your browsing experience. Slow download speed, constant crashing, security concerns, and multiple pop-ups are some of the issues many IE user complain of. Many have switched to Mozilla Firefox or Google Chrome for these reasons. If you are happy with Internet Explorer and want to fix the problems with the browser, there are a few ways to diagnose and troubleshoot them at the same time.
Determine if you are having a problem with the overall IE software, or with little things, such as video or sound playback. If you are having problems with small applications, the issue is probably something having to do with the Add-ons that Internet Explorer has. Click "Start," then "All Programs," navigate to "Accessories," select "System Tools," and then click on "Internet Explorer (No Add-ons)." This will allow you to verify if you have a problem with add-ons. If you do, you can still use Internet Explorer without them. Reset your IE settings. If you are having problems with the overall execution of the software, it could be that your settings aren't correct. Go into "Internet Options" and then "Settings." Scroll through the settings until you see "reset settings" and click on it to reset the settings. This will give you a clean slate to work with and should eliminate many of the larger problems. Run the Microsoft Malicious Software Removal Tool (See Below). http://www.microsoft.com/downloads/details.aspx?FamilyId=AD724AE0-E72D-4F54-9AB3-75B8EB148356&displaylang=en
Tips for solving problems when Internet Explorer crashes or stops working http://windows.microsoft.com/en-US/windows-vista/Tips-for-solving-problems-with-Internet-Explorer
If you have malware or spyware, it is probably causing problems with your setup. Clicking on the removal tool will allow your computer to diagnose and remove the virus. Update Internet If you run the newest version of Internet Explorer, you'll find that some of the issues you are experiencing have been fixed. http://www.enhanceie.com/ie/troubleshoot.asp