Vista - accessing network drives from vista

Hi,

I have one program which runs in vista OS, which is supposed to read
some files from a W2K server. I map a network drive and when I run
the program as a regaular user I am able to read the files, but when I
run the program in admin mode (runas), the program is not seeing the
network drive, I get an error back with 'file or directory not found'.
Is there something special in Vista that cause this problem?

Just becuase standard user mapped the drive means admin can not see
the mapped drive?

Thanks.