What just happen? Grub read error message

[Brittany Fleischer]

My system was working very good when my computer went to scrrensaver mode, it then freezed my system to the point where I had to push the power of button. 

Now I am recieving "grub error" messages along with auto restart when I try to start up my system. I then get the error:

Boot from (hd0,0) ext3 5ec9b9c0-238e-49a9-8c09-81460343f436
Starting up
Uncompression error

--System halted"

What is going on? I hope i don't have to reload ubuntu because I do have some important files that I am wanting to save.

Brittany

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