I am running Netware 5.1sp6 and the client is 4.91 sp1 on a Win XP Pro sp2

The problem I am having is that when I initially log in I get my mapped
drives (H, K, and N and Z) which are correct. Then if I log into the
computer again without restarting the machine I get another mapped drive
(Y). So, every time I log into the computer the mapped drives increas by 1.

Any help would be greatly appreciated.