If you’re installing Windows XP Service Pack 2 and it halts or hangs on you while it is allegedly “Checking Product Key”, you can fix it like so:

1) Please go into the CMD prompt (Start/Run –> cmd.exe )

2) Then type cd /d %windir%\inf and make sure we are in that
directory.

3) Then type ren oem*.inf oem*.old, it will go back to the prompt
after giving you some error (Do not worry about it)

4) Then type ren oem*.pnf oem*.old1, it will go back to the prompt
after giving you some error (Do not worry about it)

5) Then goto start – run – type “%windir%\inf” and you will see
the files in the folder.

6) Then find the file by name INFCACHE.1 and take a backup of it
to desktop (by copying it to desktop) and delete the INFCACHE.1
from c:\windows\inf.

7) Close all windows and reboot the computer to safe mode and
start the installation of SP2 and it should go fine.

This solution is dotted all around the internet, but I can’t find it’s original source. If you know the source, let me know and I’ll credit it correctly.

Written by Phil Wiffen

Phil is an IT Professional working in Cambridge, England. He generally blogs about useful solutions that he comes across in his work/play.

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