You mean the flash projector? And crashing as in "The flasplayer.exe has stopped working" ?
Can you send a screenshot of that?
First you need to know Flash Support is ending REAL soon, so no matter what you do you'll have troubles with them.
Now,
1) It's eating way too much your RAM as you might be multitasking a lot while playing them. Try clearing your background apps or restart & use it again.
2) You might be using bad game files & thus it's crashing because I remember there are some bad files here & there. Plus, the MEGA repository is really jumbled up.
You gotta download the better files.
3) Change the Preferences & toggle between options to see which are best for you. Plus keep your Windows for "Better APP Performance".
4) Run the Flash Projector as Administrator & also toggle some options in the properties.
5) If it's a white screen bug, you're missing the SUB files. Download the contents within the sub folder.
Finally, if NONE of these work I guess you
can convert to playing on Android phone.
You don't need any Flash Player for Android!
Just install the desired games from this link:
Mega
If you got any questions about android, do ask me.