Excelsior

So when I open up the client, it lets me log in, choose character and all that, but when it goes to actually get me in the game, it minimizes and won't let me maximize it. This happened on another computer, and to fix it that time I had to back up to a previous registry. I can't do that on this computer because its not mine. I've tried reinstalling twice and it didn't help. Any suggestions?

Easy fix, a couple solutions.

Either:

1) ALT+ENTER (this puts the client into fullscreen) then ALT+ENTER again.

OR

2) Right-click on the 'Ultima Online' box on the Taskbar (just right of the Start Menu) and select Maximize, then Restore, or vice versa.