im having the same classpnp.sys bsod, i just started to get it, after having no problems with my :
amd k-6-2 550
Via P5a mobo
Maxtor ata/100 add-on card
maxtor 160 hd
Western dig. 29 gig
and geforce 2 gts
i dont know y im suddenly gettin them, but i get them every 20 min or so. i noticed that i have the add-on maxtor ata/100 card.. could that be the problem???