After Windows Xp SP3 Installation you cannot uninstall Windows Internet Explorer 7 or Internet Explorer 8 Beta 1.
To uninstall IE from your system you need to revert Service Pack installation , and only then uninstall Internet Explorer
Follow MS SP Removal Guide
Note: This issue does not occur if you Install IE after SP3 installation
Tired working with Internet Explorer 8 beta?
IE8 Beta 1 occasionally crashes or doesn't respond well when browsing websites, and users suffer to close the browser with apply to send the error study to Microsoft.
The bugs or crashes happen more frequently especially if you are using any third part application as Yahoo or Google toolbar.
IE8 can be uninstall by via Add or Remove Programs in Windows XP
In Windows Vista, Windows Internet Explorer 8 is been categorizing as an ‘update’. Read more