if i close 3d max 5.1 in windows 7 3dmax.exe no close in process. How to fix this problem?
are you saying after you highlight it in the windows task manager and then hit "end process" button in bottom right corner it still wont close?
you could install virtual pc on some version types of windows 7. Its free
https://support.microsoft.com/en-us/kb/958559
put xp on the virtual pc drive
and then try installing max 5 or earlier version on the virtual pc. XP
Your performance might suck but maybe its just enough to help you.
Worst case if it doesnt work virtual pc can be deleted easily.
I have not tested my idea though.