to uninstall ie7 for windows xp:
Method 1: Use "Add or Remove Programs" to uninstall Internet Explorer 7Step 1: Use "Add or Remove Programs" to uninstall Internet Explorer 7a. Click Start, and then click Run.
b. In the Open box, type appwiz.cpl, and then click OK.
c. In the list of programs, click Windows Internet Explorer 7, and then click Remove.
d. Follow the wizard instructions to uninstall Internet Explorer 7.
Method 2: Use Spuninst.exe to uninstall Internet Explorer 7Step 1: Make hidden files and hidden folders visiblea. Click Start, and then click My Documents.
b. On the Tools menu, click Folder Options.
c. Click the View tab.
d. In the Advanced settings list, under Hidden files and folders, click Show hidden files and folders, and then click OK.
Step 2: Run Spuninst.exe to uninstall Internet Explorer 7a. Click Start, and then click Run.
b. In the Open box, type %windir%\ie7\spuninst\spuninst.exe, and then click OK.
c. Follow the wizard instructions to uninstall Internet Explorer 7.
full kb article here:
http://support.microsoft.com/kb/927177