How to reset Mac OS X Lion system?

I installed Adobe Master Collection CS5.5 Trial version on my 17" MacBook Pro. But After Effects crashes everytime I open the program. I searched on Google but I didn't find the answer.
The warning is:
I created a new user account and After Effects CS5.5 works well. So I think there are something wrong in my main account.
I want to know is there any way to reset the system just like a new account? I don't want to transfer the data, that would take a long time.
How to reset?
Thanks!!!

Well, I don't want to transfer the data, it would cost me a long time. In fact I just creat a new acount and then transfer the data it should be ok.
I want to know is there anyway to solve this issue without reinstall lion or create a new account and transfer the data.
But I would try your way if there was not any better solution.
Thanks!

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