Sorry about the out of date instructions for OTScanIt, seems it's been updated again.
Nothing too conclusive in the logs.
You do have one repetitive fault with your hard drive though that might be associated with the problem you're having.
- Click My Computer
- Right click your C:\ drive and select Properties
- Click the Tools tab.
- Under Error-checking click Check Now
- Check the following.
- Automatically fix file system errors
- Scan for and attempt recovery of bad sectors.
- Click Start
- You will get a message saying it can't perform the scan and asking if you want to schedule it for when you next re-boot, answer Yes
- Re-boot your computer.
The scan will take a while, and will attempt to repair the bad block noted in your Event log.
When it's finished, re-boot your computer a couple of times and see if you still get the notifications. If so, make note of any error codes and/or other details and post them back here.
Although SP3 does not add anything security wise to what a fully updated SP2 has, it's as well to update to SP3, as SP2 will eventually not be supported and therefore you'll be unable to keep current with updates.