Windows hangs on shutdown

Running 38 Compaq Deskpro 2000’s with Win95 osr2 and Explorer 4 everything is fine. I loaded Explorer 5 and the machines hang at the Windows “cloud” shut down screen. I loaded Explorer 5.5 same thing. I’ve disabled all power saving controls, Windowsand bios. There is no bios update from Compaq. Is there a patch I don’t know about? Can I remove the Explorer compleatly? Thanks for the help Chris