My MBP 13" wont boot up; asking for restart each time i power on.

hi,
i found a folder named "usr" in my mac. not knowing how it came there, i deleted it. at the same time, i was updating safari to the latest version-5. i tried to open itunes, but it wouldn't. in between i gave for emptying trash and i think that was when everything went wrong. later when i checked the satus of trash bin, it said, it couldn't access trash as it was still in the process of emptying. i waited for some ten minutes before shutting down.
each time i would start up afterwards, the boot up sound will be heard, a dark screen overlaps the startup screen from top, and gives the warning, like, "you need to restart your machine"; then giving details on how to restart. the message appears in three languages.
anyone can help?

Hi
Although you did not know it (probably) but somehow you found one of the invisible folders that makes up your mac's operating system. Clearly in hindsight this was an idiotic thing to do.
Your best bet now is to insert the Installer Disk that came with your laptop and reinstall the OS. No it won't delete anything and it should preserve your account as it exists. Having said that this all depends on your seeming desire to delete things you don't understand. To protect you from yourself it might be best if you made a back up of all your data first.
Tony

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