Windows 95 (950B also known as OSR2) was installed on a freshly formatted drive. Any attempt to run a DOS program or open a DOS window results in a crash.
The form of the crash is a quick error message replaced by a black screen. The message does say something about waiting for system to respond and hitting ctrl/alt/del if it doesn't, and it never does respond.
DOS runs just fine when rebooted to it from shutdown or when activated by the opening menu (from F8) at boot time.
System is modern, and as a dual boot system, runs NT4 off a partition that is fully hidden from 95 just fine. Won't bother with details of system unless pertinent.
I saw something like this two years ago, but have forgotten all the details of what I did then. Any idea what I should investigate first? Don't expect quick responces, as I can only access system every few days as it is at the home a a busy friend.