Unavailable Network resources

I use my laptop in the office, at home and when I go see customers.
At every site I use different network resources. Drives, printers etc.
When I move around and those resources are unavailable, the system becomes unrealiable.
Explorer crashes, I can’t print etc, system SLOOOOW!

IS there a way to have XP delete any items in My Network Places during login?
Better yet, is there a way to stop XP from searching for these resources every time you open My Computer or try to print something?