Sunday 20 January 2008

0x800700C1 fix

Probably spent way too long getting this school PC working again ...

In short
As you tried to login to Windows XP Home (SP2) it showed a message and logged out again.
A problem is preventing Windows from accurately checking the license for this computer. Error code: 0x800700C1
The suggested fix for error 0x800700C1 had been try re-registering regwizc/licdll or see 310794 from MS and if they don't work reinstall/recover XP - and more than likely lose your applications and settings.

In short, the answer I found was to uninstall Windows XP Service Pack 2 (SP2) using Safe Mode, which gets rid of the Windows Genuine Advantage that's causing the error. Then reboot and reinstall SP2 which resets WGA. I had to activate again (prob from resetting wpa.dbl earlier) and then install IE7 from MS Downloads before I could run WindowsUpdate.

[After reinstalling IE7 I got error 0x800703EE from WindowsUpdate which I traced to c:\windows\system32\wups2.dll - file length was 0 bytes. Deleting the file and reloading WindowsUpdate fixed that.]

1 comment:

redleg said...

I should also have mentioned that I traced the occurrence of the fault back to an error in the Event Viewer. Sophos Anti-Virus reported Event ID 6 with these details:
E-FAILURE CManager::BeginProcessing in the ComponentManager component encountered a catastrophic error that it could not recover from.

Sophos happily updated and initialised again after the SP2 reinstall.

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