Bytor,
It is often something simple that prevents windows from loading - like a small reg file corruption that according to the error message "could cause windows to report an incorrect hard drive capacity" (God forbid)
- or some similar prob that is easily fixed, if only you could get into windows or safe mode.
....If you have a start-up disk made, now would be a good time to dig it out. Win98 startup disk has some very good tools in it, far better than the W95 start-up disk.
Using the start-up disk, if I recall correctly, there will be some rudimentary instructions and you will wind up at the "A" prompt. You type "help" or some such to get to the options. Try each tool. You will have to re-boot multiple times.
If you don't have a start-up disk, try to get into Set Up and see what you can see.
Best wishes