Check for Possible Causes
1. Try opening Internet Explorer without add-ons. You can do this by browsing the Start menu and expanding the folder 'Accessories' and the sub-folder 'System Tools.' Click on 'Internet Explorer (No Add-ons).' If the program seems to function properly with the add-ons disabled, follow the next step.
2. Click 'Tools' and select 'Internet Options' inside of Internet Explorer. Select the 'Programs' tab and click on 'Manage Add-ons'. Disable anything on the list that is not by the 'Microsoft Corporation' under the 'Publisher' column. You may need to update Adobe Flash and Java after completing this step. If the errors still occur, continue to the next step.

3. Download an anti-malware scanning program and install it. Run a complete scan and remove any infection results.
Reinstall and Update Internet Explorer
4. Update your Internet Explorer by visiting the Microsoft website for Internet Explorer 8 (see Resources).
5. Download and install the appropriate version of Internet Explorer.
6. Reboot the PC to complete installation. Open the new Internet Explorer and follow the one-time setup wizard.