Mac needs to be restarted after Lion upgrade

hi, can anyone help me? I upgraded my Mac to Lion, ever since then I am having problems: every time I turn on the Mac it tells be to hold down the power button and restart it, I do this and it starts to work only then. I have been having problems with Outlook 2011 where I have to keep on rebuilding the database. The system seems to be a lot slower as well. Dose anyone know if Apple are aware of these problems and if they are doing anything about it. I would of thought when it comes to apple it would of been more stable then this. Let's Waite and see if apple gets in on this discussion.

Hi, thanks for the reply. I looked up Ketnel Panic on Wikipedia and the picture that is showing up on it for Mac is what I'm getting, it's the gray screen and the message in several different languages telling you to power down and then restart. What I can't understand is the PC was working great on lepored with no problems, I up graded by the App store to Lion, dose this not mean it is been caused by lion or what?
My only problem is I'm new to apple, I use time machine to back up but how do I reinstall an OS if I have no disc as when I bought the PC from new there was no disc provided in January? Will I have to install all the software again? I also use pareralls software for XP, will XP have to be reinstalled again and all softwares installed on the XP side? Is there a way for apple to scan the PC and locate the fault and just install a fix, windows have fix updates all the time what dose apple not as it seems I'm not the only person that has had these faults?

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