Cannot open access

I am not able to open my tables in access. I was working fine. But i dont know what happened to it.I am not even able to open it in asp.net either. When i open access and try to load a table in a db, a message box appears as unknown. Thats it i am not able to see even the contents. can some one help me as how to solve this problem. I tried to repair my office xp. but still i have the same one.
I am not even able to update the latest service packs for my office.

thanks,
-Sriram

I've got the same problem today and its a complete noodle scratcher. Has anybody got a solution?

Use the decompile switch and resolve any missing references in the database before recompiling
Hit Start > Run > msaccess /decompile
It's advertised as the undocumented solution to this type of problem and not be used too often.
Additionally you may wish to copy all objects/data into a new db afterwards
Troy