I dragged out my old desktop with a Windows 98 OS to test some hardware peripherals that were given to me. It's been so long since I used W98, I plugged in a keyboard and optical mouse into USB ports, but the system failed to boot. I the got out the old trackball mouse and keyboard that were PS1 connected and the system then booted. I noticed when it did boot there was a screen message that showed plug and play was disabled. I wasn't sure I had PnP on W98 or whether enabling it would discombobulate anything else. Since then I haven't seen this message screen as long as I leave the PS1 devices in. Would it be advisable to enable PnP and if so, how?