Permission Issue..: I cannot Erase/Save Files

Permission Issue..: I cannot Erase/Save Files

I am using MAC OS X Snow Leopard.
I was working on Adobe Indesign and all of sudden,
I cannot erase files, save files in certain format/certain fonts.

so I rebooted my iMac.
Then, I have no permission for anything.
I cannot even save page files as PDF.

Why does this happen all of sudden?
I cannot do any of work now due to this problem.

Please advice how to fix.
Thank You so much in advance.


(BTW, the account is admin)