My Mac book pro 13 running osx lion froze. Please help

My Mac book pro 13 running osx lion froze. It is stuck at the grey apple screen with the wheel spinning. How can I reload the operating system without the disk? Please help

What exact model MBP do you have?  Was Lion the installed OSX when new?
Have you tried a restart?
Have you tried a Safe Boot?
http://support.apple.com/kb/HT1564?viewlocale=en_US
Ciao.

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