Several things come to mind, first if the PC was on at the time of any mains interuptions etc then it's quite possible to have suffered file corruption... run check disk and Sfc routines.
Anything electronic doesn't like disturbances to the power supply, so if anything is acting up the first thing to do is unplug it for a while and try again. If it still won't work then try a factory reset, you need to consult the documentation for the unit for that.
The problem with generators is that the mains quality may be "poor". I'm thinking more in terms of the "quality" of the AC waveform, the normal mains is sinusoidal with no harmonic content, and also short term fluctuations and "dips" in voltage.
It's an unknown quantity.