That's an easy one. You not only need to install the original Windows 98, but also the original drivers that were supplied with the computer when it was new. Unless, of course, a new video card was installed on it somewhere in the past ten years. Then you install the drivers that came with that new card.
My computer is a UNIKA,also produced as GATEWAY, running on Windows 98. When I was using it it went into safe mode.
The only way that I could get it out of safe mode was to uninstall the total program and download the orignal Windows 98 disk that was supplied with the computer when it was new.
However when I restarted it I found that the colour format is set at 16 colours and I am unable to change it to 256 colours.
I have tried changing it following the on screen help pages but it seems to be locked on 16.
I would appreciate any help to solve this problem.