[ubuntu] mounting file system problems in 11.10

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http://ubuntuforums.org – I am a completely new user of Ubuntu/Linux...I installed version 11.10 recently...the problem is...when i login with my administrative account,it does not mount the file systems,it does detect the USB flash drive but doesn't mount it...unable to mount,not authorized is the message..whereas..when i log in with a guest session,it mounts all the file systems,flash drive...everything...where is the problem...? Any solutions....?Also,I am unable to shut down the system from admin. account. Even with the guest session,shut down dowsn't work,I have to Hibernate.. PS:- initially it did mount all th (Hardware)