Hi philal. I have found that it's best to backup all the important data, format the hard drive and make a fresh installation of Windows 98. That way you remove all the accumulated rubbish on the computer and everything runs so much better.
I have done it and had no problems whatsoever. The upgrade was in an effort to cure a driver problem and it solved this and also provided much better plug and play operation and also usb support. Go for it.
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