Yes and if you want them back reinstall the latest versions.
This is what MS say "If you are having problems with Internet Explorer 7 hanging, crashing, silently closing or other bizarre behavior, an incompatible toolbar or other add-on maybe involved. The fastest way to determine if an add-on is causing the problem is to run Internet Explorer 7 with no add-ons. You can do this by going to Start, clicking All Programs, click Accessories, click System Tools and click Internet Explorer (No add-ons). This disables all add-ons from loading in that instance of Internet Explorer. If the problem goes away, you can manually disable specific add-ons to find the specific one causing the problem. Below are instructions on how to manually disable a specific toolbar and a list of known incompatible toolbars that can cause serious issues with Internet Explorer 7.
To disable a toolbar open Internet Explorer 7, follow these steps:
In Windows, click the Start button. Click All Programs. Click Accessories. Click System Tools and then click Internet Explorer (No add-ons). Once you determine the toolbar causing the issue, you should uninstall the toolbar through Add or Remove Programs in Windows Control Panel and then check the toolbar’s website for an updated version." So you can disable instead if you wish.
The other point to follow is to disable any anti virus and the like during IE7 install.