I have just upgraded a Win XP PC to Win 10. I had a couple of old smallish (19" and 22") widescreen LCD monitors lying about and the NVidia graphics card in the machine had 2 DVI-I outputs so I thought I'd try and rig both monitors up, side by side. If they worked, fine, and if not I'd buy a big new widescreen monitor.
Well one monitor worked straight off because it had a DVI input and I had a DVI lead. The other monitor turned out to have an analogue input (VGA) so I bought a DVI-I to VGA converter for about £1.50 on
eBay and that solved that problem. I got the most up to date driver for the graphics card but didn't bother doing anything for the monitors themselves. All I did was to enable both outputs and configure the analogue output manually to suit the monitor's native resolution and a 60 Hz refresh rate.
The arrangement works pretty well. The 2 monitors don't match so at some point when I have cash to spare I will buy a new widescreen monitor anyway.
The only annoying thing so far is that Windows forgets to apply the settings to the second monitor when I boot the PC. I have to go into the NVidia control panel and reapply the settings. It has remembered what they are but they don't get applied until I change them and then change them back.
A long-winded way of saying 'You could try the old monitor, but buy a nice new one if you can afford it, and don't worry about drivers'!