Question : Checking if an SSN exists

Right now I am having a problem where users are typing in duplicate information for our personnel.  What I would like to see happen is if the SSN is matched in the table then a prompt comes up that says "That SSN Already exists, would liek to view that record?"  If the user chooses yes then that record is opened, if they choose no then it's just like a cancel command.

The table I am working with is tblCrew and the field is SSN.  
Thanks for the help.

V/r
John

Answer : Checking if an SSN exists

I just noticed the bit in the brackets of  of the error "Windows cannot determine the user or computer name. (Not enough storage is available to complete this operation. ). Group Policy processing aborted."  

I don't suppose either your C: drive or home directory drive are very close to 100% full?  You can get some very strange errors if you run out of temporary storage ..