Automatic updates

I was having issues with some small things..My recycle bin wasn't making any sounds(for the recap of that read it in my post No sounds in my recycle bin)..IE6 icon was missing from the desk top and then was there again..Search didn't work from the start menu though it did from the toolbar in Windows explorer..ect. ect...anyhow i reinstalled Windows and it fixed all that stuff but for some reason now it wont let me update..I am running XPSP2..i have tried to turn auto update off and do it manually on the website it tells me that the updates are downloaded and ready to be installed when i try it tells me that "some updates were not able to be installed" and then lists all of them..These troubles have been going on for two weeks and i think i am going bald..Mcafee turns up nothing spybot same ad aware same..please help

Have a look here on Kelly's Korner, the one that says why can't I download updates

http://www.kellys-korner-xp.com/top10faqs.htm