Helping people with computers... one answer at a time.
USB device detection normally works well, albeit mysteriously. The mouse is a critical Windows component, so if your USB mouse is not detected, an error results.
Sometimes, but not always, my USB mouse will not be detected at startup. It is plugged into a 4 port hub. When Win98 loads it gives me the no PS2 mouse detected. I can continue to load Windows. After Windows has finished loading, I unplug and then replug the USB mouse, at it is detected and I'm good to go. Why is it not being detected? I have found no rhyme or reason to when it is not detected. Usually, if the mouse is not detected, it starts up like that several times in a row, then I am OK for a few weeks, and then back to several days of nondetection.
Problems that come and go like this are some of the hardest to resolve.
I don't have a magic bullet for you, but there are some things we can look at.
The very first thing I would try is removing the hub from the equation, and plugging the mouse directly into the PC. For various reasons (not the least of which is Win98 itself), I give this the highest probability of resolving the issue. If it does, you might want to try another, different hub, or seeing if you can arrange things such that no hub is required for the mouse.
If your PC has more than one USB port, try a different one - both without, and with, the hub.
I would visit the computer manufacturer's web site for updated drivers for the computer's BIOS, the USB ports, and for the mouse itself.
Normally I'd say make sure that Windows is up to date, particularly since Win98's USB support was never all that great. Unfortunately, Windows 98 is now past end-of-life, and Microsoft's support for it has ended. (Naturally readers with later versions of Windows should make sure that it's up to date by visiting Windows Update.)
As a last attempt, it might be interesting to find an old PS2 mouse and plug it into the computer's mouse port and see how that changes things, if at all. If nothing else, it should provide you with a reliably working mouse.
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