On Jun 23, 9:04*pm, Susan wrote:

I have windows XP SP2 installed on Acer Aspire 5050. These few days,
when I turn on my laptop in the log on *windows screen, mouse and
keyboard does not work, I cannot move mouse or enter my user name and
password.

There are many ways to tickle your problems ...

You can rule out hardware issue by booting up your PC with
a bootable Knoppix CD, and check if your mouse/keyboard
work.

Once you rule out hardware issue, the easiest way to
resolve your XP problem is by restoring your OS from
a backup (assume you have had regular backups).

If you don't have regular backup, see if you have a
set of restore CD/DVD that came with your Acer.

My Acer Aspire One has a restore option that enables
me to restore the OS from day one. But this means that
I would lose everything since day one. That is why I
prefer to use my regular backups for bypassing problems.

If you like troubleshooting, boot up your PC with a bootable
utilty "UBCD4Win", and run anti-Virus scans and other
diagnostics.

Good luck.