Time to do your usual cleaning with canned air and replace all heat sink compounds in this PC.
It's possible the HDD is failing but I'm having to guess with so little detail. Maybe you should have your tech look at this PC?
this PC is hooked up to a older CNC machine and all i run is easy.exe that send my programs to the machine. Recently i got a blue screen and when i shut it off it said vmm32.vxd missing reinstall but now that message is gone and it freezes on windows 95 screen ( blue sky and clouds). Any ideas?