Hi Jon,
While I can't speak as to what may have happened during your power outage,
here are a few suggestions to consider:
Go to Start/Run/CMD and type in:
D: (Replace D: with your proper CD Rom letter)
cd \i386
expand taskmgr.ex_ %SystemRoot%\SYSTEM32\taskmgr.exe
For the passwords:
Go to Start/Run and type in: services.msc
Scroll down to Protected Storage and verify that the service is started.
Also, follow the process mentioned here, it works for OE/Outlook/Auto
Complete and DUN.
http://support.microsoft.com/default.aspx?scid=kb;EN-US;q264672
Lastly in attempt to recover your corrupt profiles, if the above doesn't
correct them:
Logon to another account with admin privilege and run System Restore.
Choose the most recent restore point and SR should restore the user
hives.
Or...
Boot into safe mode and log in as Administrator. Copy ntuser.dat from
%windir%\repair to "Documents and Settings\[your user id]". Now do a system
restore to a point in time prior to when the corruption message began to
appear.
Or...
Relocate NTUserdat
Look in HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows
NT\CurrentVersion\ProfileList and find the profile you want to change and
then change ProfileImagePath to the ntuser.dat folder that you want to use.
You must manually copy or move the ntuser.dat file there.
Corrupt Hive
http://www.kellys-korner-xp.com/xp_sys32.htm
How to Recover from a Corrupted Registry
http://support.microsoft.com/default.aspx?scid=kb;en-us;Q307545
As for the processes and VSN, run the small utility on line 292 - Are your
processes listed there?
http://www.kellys-korner-xp.com/xp_tweaks.htm
Also, have you checked the target path to VSN? Do all of your associations
need to be reset, exe's, lnk's? If so, some help:
EXE and LNK Fix for Windows XP - Line 12
http://www.kellys-korner-xp.com/xp_tweaks.htm
File Association Fixes
http://www.dougknox.com/xp/file_assoc.htm
Restore File Types back to Default
http://www.dougknox.com/xp/tips/xp_easy_file.htm
If none of this, you may need to run a repair install. Good luck, Jon.
Perform an In-Place Upgrade (Reinstallation) of Windows XP
http://support.microsoft.com/default.aspx?scid=kb;en-us;Q315341
/top10faqs.htm