Windows Logon Error PLEASE HELP

Hello,
When i try and boot up my pc with Windows Xp. I have windows 7 and ubuntu. It has a blue screen of death saying
Stop: C000021a Fatal System Error
The logon process system process terminate unexpectedly
with a status of 0xC00000434 (0X000000000 0X000000000)
PLEASE HELP:
SPECS ARE:
Dell optiplex gx280 sff
2GB Ram
Intel Pentium 4 @3.00GHz
Maxtor 7Y250MO ATA Device 250GB
It would be really helpful if u can help me
Alex
1 answer Last reply
More about windows logon error help
  1. Ubuntu may have overwritten a necessary file.

    http://support.microsoft.com/kb/156669
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