Recieving Continuous Vxd Vmm errors?

Have soyo 5ehm1.2mb. amd 500K6-2.Have swapped mem.diff brand,video card,diff. brand, sound card,diff.brand, hard drive,diff.brand. Recieve vxd vmm errors when running or trying to reload win 98. Have reformatted h/d many times and always have same problem. Where is this coming from? CAN ANYONE HELP!! Thanks, Denny