IE not responding

Just did a system restore on my p4 1.80Ghz with 256 Ram. with XP Home. So I
downloaded SP1 onto the desktop and run it to SP1. The IE is version
6.0.2800.11.06.xpsp1.020828-1920.

When I did the Windowsupdates, it went as far as installing the software for
the updater(if I am correct here) and suppose to re-start the pc. When I
restart the pc, the windows were unable to continue the windowsupdates and
machine seems hang saying IE explorer not responding.. The module name is
"hungapp" and when I do a search, it comes to 'nothing'. The pc is fully
protected by NAV2005 updated to the latest definition. It seems to be that
there is a problem with teh IE, always not responding. Thinking that my pc
was infected by virus and that was precisely why I did a system recovery. The
situation does not seems to improved. Can it be my Ram? or can I just
download IE6 on destop ansd executed it. Appreciate any advice from you all,
thanks
.