[NTLUG:Discuss] virtual box and multiple OS's

[lonestar17]

Hello-All,
   Anybody have experience with VB?    I have a good running Ubuntu 
10.10 and wanted to try Mint 11 as a 2nd OS.  Since Ubuntu went to 
((unity)) it's no longer a friendly distro!!
   When I try to click ADD in VB menu for a new OS, this is the response:

Cannot create the machine folder mint in the parent folder C:/Users/user 
only me/VirtualBox VMs. Please check that the parent really exists and 
that you have permissions to create the machine folder.
   From all the sites I've visited, I see nothing regarding this 
problem.   NOW, I have Mint installed and running OK, in Admin. mode??  
Which I never use, only work in standard mode, where I have Ubuntu 10.10 
installed and running OK....Why can't I add Mint in standard mode?
   I see all the screen shots on various sites of multiple OS"s 
installed in ONE instance of VirtualBox..
   What am I missing here??
   Thanks for help/suggestions.
   John in Dallas.