Tell us more about the problem.
Nothing is clear from your description.

Aster software is not responsive when working with AutoCAD software and crashes
But there is no problem in using other software

It is still not clear what exactly is not responding. Could you give examples?

Do you mean ASTER application is not responsive or you mean ASTER workplace in which you run the aforementioned application ?
As from your description its not clear what exactly is the issue.

I've heard that Aster allows multiple users to simultaneously play online multiplayer games on a single computer, but I'm curious about the potential for cheating. Can Aster be used to gain an unfair advantage in games by allowing one player to control multiple characters simultaneously? Are there any measures in place to prevent or detect cheating with Aster?

You would have to have super reflex to be able to control multiple characters while gaming.
Additionally, Games employ anticheat programs to prevent cheatings
As for using ASTER for cheating, what you do on the workplaces is entirely up to the user.