Error at level of logging into server

[Curmudgen]

Hi I have been playing on a MAC for several years with no problems. Trying to consolidate my computer use so I got ISO files, went through installation, used Titanium Launcher, etc. and installing it on my Surface Pro.

Everything goes well. I can log onto server, however when I pick blue and click to get into it I get a popup everytime and have to close. I have completely uninstalled and reinstalled one time and it still happens.

"The instruction at 0x0000000005C145B4 referenced memory at 0x000000000687F0DC. The memory could not be read. Click ok to terminate the program."

I am not very computer literate....has anyone had this problem or know what I can do about it?