I just installed lion and suddenly I have problems starting the computer

I installed lion on my mac a week ago (mac 20.5 inch) and suddenly I have problems starting the computes, sometimes, but lately almost always, it takes a long time to start up (more than 2 min) and then the keyboard does not work and the mouse works partially i.e. the cursor moves but does not respond to clicks, also, when I move the cursor over the dock it does not appear the tag with the application name I'm over, basically I can't do anything except reboot the hard way. After a few times it usually stops happening but I don't know why exactly. Sometimes after rebooting a message appears indicating that I restarted the computer after having a problem and asks me if I want to open all the applications that I had in the previous session (in this case none) when I say yes the problem keeps happening but when I say no the problem stops. To make thins even more difficult just now it didn't let me choose "cancel" because the keyboard and the mouse have the same problems I explained before.

Are they each separately paired with the computer via BT preferences?
You also can check your Startup Disk preferences by selecting your startup volume then clicking on Restart. Does this cause a faster restart?
You might also try booting into Safe Mode then booting normally. Safe mode takes considerably longer for startup and will require you enter your password.

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