When attempting to install Win 98 over Win 95 on a pentium, with three physical drives. C drive is a 7 gig with three equal partitians. When the checking of disks begins, C drive, with over 500 meg available checks ok, D drive stalls at about 87% and the cycling activity icon slows. after 10-20 seconds the display goes to 100% and no further activity occurs. Have removed one and both of the other disks and repeated install, with hangup still occurring after the C drive is checked. Have run scandisk and C and its partitions all show OK. Scandisk was run from dos, all programs shut down from ctl-alt-del.