I am able to login, create a character and move around a little bit, But after a little while the game crashes... I can't move any items or anything. Any ideas anyone?
Did you download the client from this site? If using Razor, is it looking in the appropriate directory that you installed the client to?
This is usually caused by using a client other than the UO:Renaissance client. Simply use the client provided on the website and verify the razor settings are pointing to the right installation (not auto detect) then you should be fine. Some servers have heavily custom clients that do not work here. If you con't Telamon on IRC he can help you diagnose any connection problems you may be having.