This behavior can occur because of a modem driver error or an invalid modem-related Windows Registry entry.
The Ptvcd.vxd virtual device driver, which is part of the PCTell modem driver files, may be loading as a StaticVXD entry in the Windows registry.
I am runnning Win 98, just replaced the power supply. Now when I start up it gets hung up while loading Windows. On "Step-by-step" confirmation, it gets stuck when loading
even if I press "no" when it asks if I want to load it.
I removed my video card (it gave me start up problems before), now it doesn't crash on the ptvcd.vxd step, but right after says "Windows Protection Error" and shuts down.