This is Windows 7.  Much is different.  The Dell\Drivers folder will only exist if you create it by installing a driver package.  When you download and install a driver package, you can extract the files to any place you want (Dell\Drivers if that's what you are comfortable with).  Like I said, the DriverStore folder will not contain drivers in a way that you would recognize.
I have a new XPS 8300 with Windows 7 64 bit.  I cannot find any folder in the directory tree that lists Dell's drivers.  I have tried typing C:\DELL\DRIVERS and nothing appears.  There is only one "DELL" folder on the directory tree and it is empty.  I have not downloaded  any drivers yet.  I wonder if I download a driver whether the driver folder would be created.  
Where are Dell Drivers on Directory Tree?