Service Pack 3 Installation problem

Everytime i try to install i always get these messages









And when its almost finish installing i Get a "ACCESS IS DENIED" message

Please help!

[p.s to get those messages i always click on ignore and the next one goes to the other]

Your Windows is corrupted, you probably did not install it properly or might have installed something and caused certain files to be deleted. Do you have your XP CD? We need to do a repair.

service pack 3 could not back up registry key

Nah my backup Xp cd broke, any other way we can do this?

Can you got it from your friend. Ask somebody to give you.. It's only repair. Fast and easy.. Probably no other way to do this. If you want to keep your files without deleting, try to find some Windows XP CD..

Nah man no friends with xp anymore ,all vistas and macs [Rich ppl] can i use system recovery or something ?

System recovery could do too. There should be a repair option in the system recovery utility.

so do i system recover my computer and then try to install service pack 3 ?

Yes. Do a repair recovery.