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Hi Leon,
Change it or leave it alone, its up to you. Its not going to cause the PC to blow up or anything drastic*.
If you don't...
Generic video drivers - You will get that system crash from time to time.
The generic PnP setting - the colour palette and rendering speeds might be less than optimum. The colour etc will be good, but not as good as it could be if the PC knew the monitor in use.
How to change...
The screens you need to change everything are pretty much the same ones you used to check the drivers and monitors.
The PC has just suffered from MS updates and their zero care factor for user settings. I would guess everything is still there, just not selected. The monitor and drivers etc should be within a drop down lists within those screens and its just a matter of reselecting them.
A matter of a couple of clicks, rather than reinstalling everything from scratch. However I have no idea about windows 8.1 and the last time I was paid to do that sort of thing, I think Bill Clinton was still in power... And while I'm happy to muck around with my PC, I'm less than keen to try via mail on someone's else new and shiny PC with my antiquated knowledge.**
The trouble shooting seems to be done, I'm sure others more up-to-date than myself will be able to point you in the right direction to make the switch back to the correct hardware settings for Window 8.1. Or the interweb will have instructions, now we know the problem it should be easy to source some instructions for changing Monitor settings/drivers for your operating system.
Steve
* assuming you don't crypto mine
** Why yes, I am a coward...
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