I dug around quite a bit... I really hope this hasn't already been a thread...
"Failed to connect to a windows service.
Windows could not connect to the System Event Notification Service service. This problem prevents limited users from logging on to the system. As an administrative user, you can review the System Event Log for details about why the service didn't respond."
This message comes with slow start up and shut downs that occasionally freeze. Another strange symptom is that sometimes (about every other time I boot up the computer) it loses the shiny-black Vista theme. Not so much a concern of aesthetic and more a note of wonkiness.
The laptop was sluggish recently and I was doing some cleaning: defrags, registry cleaning, virus/spyware scans, etc. I... have a theory my sweep with CCleaner may have done something it really shouldn't have. I'm unsure what to do about this if it is true though, because although I didn't delete them, all my restore points are gone. I also recently changed the virtual memory size, if that is relevant.
Also uncertain of relevancy, but the worst of it (Service message) began while I was toying around between Pidgin and Trillian. Trillian crashed... something. There are so many event logs now that I'm not able to figure out what it was
I'm really not as familiar with the workings of this computer as I wish I was, I'm really not certain about how to diagnos a problem from what I see

I've also never really gone to a tech forum before: if you need more info you'll probably have to tell me how/where to get it.
It is an Inspiron 1525 with Windows Vista Home Premium 32, post SP-1/2, 1014 MB RAM and a 136 GB HDD. Also running AVG, Window's Defender is down, Firewall is on.