I have got exactly the same problem as in the link above with the XP Professional.
that i can not access XP at all (Neither normal mode nor safe mode).
The message that i keep receiving is :
"userinit.exe- Application error" "The application failed to initialize properly (0xc0000005) Click on OK to terminate the application"
I tried this
But it did not help, because i would not able to access the safe mode.
Place your XP CD in and navigate to the Recovery Console.
Change the C:\Windows prompt to: C:\Windows\System32 and copy userinit.exe to wsaupdater.exe
Reboot into Safe Mode and modify:
change userinit in HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows
NT\CurrentVersion\Winlogon from wsaupdater.exe, to userinit.exe,
Recovering XP using the Recover Console (Line 333) Right hand side:
Any other insights
Please bear in mind that i can not access window at all, therefore I can not go online and scan the PC for virus or whatever other solutions that might be suggested