eqitems.exe comes up, then poof

[lerxst2112]

If you're getting an error like that then you aren't typing the line exactly. You can actually copy it from here and paste it into the command prompt if you click the icon in the upper left of the command prompt window and look under edit.

You should also open the command prompt as administrator or the registrations won't work. To do that click start, type cmd, and right-click it and pick run as administrator.