I was typing and lost power yesterday,but I see everything I typed was autosaved.That's convenient.
I looked on this computer(Windows 7),and I have the ServicesPipeTimeout set to 180000.180000 milliseconds would equal approximately 3 minutes for the service to start,if you wanted to try that.The 120000 was 2 minutes,so you'd be giving the Service a minute more to Start.Probably might not make a difference,though.
If you wanted to try that,you've already got the registry backup,so you should be good there.
You'd go to Start,Run,type regedit.exe,then press OK.
Navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control
Right-click ServicesPipeTimeout, and then click Modify.
Click Decimal,type 180000,then click OK.
Exit the registry,then reboot your computer.
Though I'm not certain if the Security Center not being on in XP is a bug,or on purpose,since it doesn't show in Spybot's settings,or on at least 3 XP computers,so far.