Can't boot up computer !!

  blackpat 10:55 25 Jan 11
Locked

(my son's computer) (Packard-Bell. windows xp and uses google chrome)
Everytime my son tries to boot up the computer, he receives the following;

windows could not start because the following file is missing or corrupt. "windowroute\system32\hal.dll." please reinstall copy of above file.

It was working fine yesterday.I would appreciate any help.
blackpat.

  Graphicool1 11:14 25 Jan 11
  northumbria61 11:18 25 Jan 11

Try booting into "safe mode" - As your computer restarts but before Windows launches, press F8.
Choose "Last Known Good Configuration" which starts your computer using the registry information that was saved at the last shutdown.

  Fruit Bat /\0/\ 18:13 26 Jan 11

Hal.dll missing or corrupt click here

  blackpat 11:13 28 Jan 11

Hi Graph, North, and Fruit bat. I have sent all the info to my son "He lives away" as soon as I get an answer from him, I will get back to you all. I really appreciate the help.
Blackpat.

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