Cannot install updates...

On a laptop running windows xp sp2, I am trying to install downloaded

updates using Custom and get the following error boxes:

first one that says problem with

wuauclt.exe has encountered a problem and needs to close

then next box says

problem with

Generic Host Process for winsvcs32 has encountered a problem and needs

to close

then finally

ntauthority\system does a mandatory shutdown in 60 secs due to a RPC

call error

and computer reboots.

I haven't seen this problem before.

Any ideas where to start?

I have already unchecked all startup items from msconfig startup tab

Have ran 3 registry checkers successfully

Have updated spywareblaster

updated and ran spybot

updated and ran adaware

I am trying to install updates automatically now and it seems to be hung

on the first one KB923689.