Reinstalling Mountain Lion after update to 10.8.1

Hello
I got a problem,
i got a Mac Mini and a MacBook unibody.
On both pc's i have the same problem i bought Mountain Lion, installed it, and updated it to 10.8.1
Now after a while my Macbook doenst startup anymore, and today my Mac Mini doesn't startup anymore,
i have to reinstall Mountain Lion again..
What the ****?? what's up? bad update??? or bad system with many bugs??

The problem isn't with the OS, it's with your system.
Boot up holding command-r keys into your Recovery Volume.
The screen should give you these choices...
Restore from TM backup
Reinstall Mac OS X
Get help online
Disk Utility
First run Disk Utility Repair Disk, if you get errors run until no errors reported or reports "the disk cannot be fixed". Then, choose Reinstall OS X. This will be an install "in place" and shouldn't effect any of your own data or settings.

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