This is one reason why one should not use Windows. I understand that not all end user have knowledge of other operating system.
Your problem can only be solved by completely uninstalling of Internet Explorer 7.
First Press Alt + Ctrl + Delete, select ieplorer.exe and then click "End Process".
Now Uninstall, follow one of the below method:
Remember this step will bring you back to Internet Explorer 6 and then later on you can download Internet Explorer 7 to update.
Personal Advise, stick with internet explorer 6.
Method 1: Use "Add or Remove Programs" to uninstall Internet Explorer 7
Step 1: Use "Add or Remove Programs" to uninstall Internet Explorer 7
a. 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.
After you uninstall Internet Explorer 7, double-click the Internet Explorer icon to verify that Internet Explorer 6 is restored.
If you cannot uninstall Internet Explorer 7 by using this method, try Method 2.
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Method 2: Use Spuninst.exe to uninstall Internet Explorer 7
Step 1: Make hidden files and hidden folders visible
a. 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.
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Step 2: Run Spuninst.exe to uninstall Internet Explorer 7
a. 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.
After you uninstall Internet Explorer 7, double-click the Internet Explorer icon to verify that Internet Explorer 6 is restored.
Now, Restart.