Thats right. You can stripe in win 2k pro, you just can't do fault tolerant with it. Only server can do that.
In addition to upgrading your disks to dynamic, you also have to have unallocated space on more than one disk. Then select the unallocated space, create volume, select either normal, spanned, or striped disk. Then add the other unallocated space from other drive(s), give the drive a letter or make it a mount point, format and you're done.
I know this works, because I just did it to 3 drives on my win2k pro machine about an hour ago.
Whoever told you there was a reg hack to do that was smoking crack at the time.