Not knowing the exact problem,one fix to it,install xp cd,boot to xp
cd,recovery,
select 1 For disk C: Press enter key for password,type:CHKDSK C: /R When
its thru (12-20 minutes),try typing:Listsvc See what all is
running,typing

isable
Disables a windows service if need be,type:HELP List all cmds Or simply
type:
EXIT And see if xp restarts....
"Johnny M" wrote:
> The XP computer hung up during the shut down. I waited about 10 minutes,
> then turned the power off. The first condition is that it will not boot up.
> It starts to load Windows, then stops and tries to restart, endlessly.
>
> When I use the xp disc, I get a notice that there is an update already in
> progress. Two of the options lead to a screen that freezes on Preparing in
> install, one black and white with a strip on the bottom, the second with a
> light blue screen and dos characters in the upper left corner.
>
> I use MacAfee antivirus software.
>
> It will open in safe mode. I have tried two Restores, of prior dates. The
> computer is presently hung up on shutting down.
>
> Thanks.