Well, after reading through pages and pages of forums, I finally realised that IE 8 does not seem to support Windows XP with Service Pack 3! What a surprise! Why Microsoft does not support Windows XP SP3 then? My PC also crashed when trying to run Firefox 3 beta 5. I think it is because I am using SP3. I really hope that Microsoft and Mozilla can address this issue.
After uninstalling XP SP3 v3311, I have been able to install the full version of SP3. Now, I have tried to install IE 8 and Firefox 3 beta 5 but no joy. It still crash my pc though...
I have given up hope on installing Firefox 3 beta 5 and also IE 8 beta 1 because both of them will crash my pc. I have to revert back to Firefox 2 and IE 7.
Something tells me that I should not give up hope so fast. I reboot the pc with SP3 and then tried to install IE 8 beta 1. Guess what? It worked!!! Too bad that Firefox 3 beta 5 did not work but never mind as IE 8 still works! Hurray!!!