I registered on WIn98SE with no problem.Entered my serial Number,No Problem,and can access all 3d Sights,no problem.I also Paid for my Poser5 Upgrade.No problem,ButI wish CL would get the patches out soon,Kupa said one would be out last week.Hopefully the one they are working on is a FULL Update and fixes ALL of the bugs ;o).CL has Every right to have you REGISTER your Program,since you paid for it,it should work,email them and ask what happened.If you DON'T have a warez copy then you got nothing to worry about,if people do,then they should rot.