Why did a critical restore take 3 hours and why have all my restore points been wiped

I have a 3 month old Dell XPS desktop that was pre-installed with Windows 8. Two weeks ago I upgraded to W8 Pro with Media Centre. I manually set restore points when I make changes.

Today, the PC failed to start correctly. I checked and found that there had been a MS critical update, and yes there was a restore point with two of my points from a few days ago. Therefore I decided to restore to yesterday.

It took almost three hours ( with the HD light full on ) to restore one day. It finally said it had restored to yesterday, but all of the restore points had been deleted, and the problems are still there.

Questions, please:

• What was it doing for three hours restoring one critical update?
  
• Why has it deleted all of my restore points?
  

Problems were:

• wlcomm.exe has stopped working.
  
• Windows Live Mail started but would not let me open any emails
  

Thanks

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