Stack overload

Hello
After installing a Visioner Scanner and a pci USB card,when I boot up the computer I get “terminating Thread due to a stack overload problem. A VxD,possibly recently insalled has consumed too much stack. Increase settings of minsps in system or remove recently installed Vxds.There are currently 6 sps allicated.” message that tells me I need to adjust my stacks, where are they and what is a good adjustment number.
Thanks