Unable to map network drives 2003 domain

Hi,

In my organisation we have setup windows 2003 domain. Now a days we are facing a strange problem.Whenever user log in to a PC using his domain account he is able to log in but the shared network drives are not getting mapped automatically.
We have share folder for each user and shared path is specified in users user account.Still network drives are not getting mapped/
And the most strange problem is that it happens with any PC like if i am logged to pc called “ABC” I wont get my network drives but if i login to PC “XYZ” i will get all the drives mapped.So thing is that it happens with any PC any time perticularly with PC having OS windows XP.
I would request you to find any solution on this and let me know.

regards
Ajit