IT Problem
Occasionally after rebooting your windows 7 or visa pc when you try to attach to you mapped network drives they will have a red x over them.This is seen quite often in windows 7 and vista.
red x on mapped drives
IT Solution
This is a known problem with microsoft and can be fixed two ways, the first is to disable UAC
If this does not fix the issue then use the link below and run the patch supplied by microsoft