thanks for u r reply...
Ya i have installed IE7.......
and u r right.....i have seen same problem related discussion ..here...
http://72.14.235.104/search?q=cache:...n&ct=clnk&cd=3
i did this ..but stiil unable to uninstall ie7.....
1. Click “Start,” and then click “Control Panel.”
2. Click “Add or Remove Programs.”
3. Check “Show Updates” at the top of the dialog box.
4. Scroll down the list to “Windows XP – Software Updates,” select “Internet Explorer 7 Beta 2Preview,” and then click "Change/Remove."
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this one helped me......
after searching lot on google.....i got this one......
http://windowsxp.mvps.org/IEFIX.htm
now i m not gettnig same error but still unable to open ie7.....