You probably have an OEM version of 98.
1.Insert the OEM Windows 98 CD-ROM into the CD-ROM drive. Press and hold down the SHIFT key as you insert the CD-ROM to prevent Windows Setup from starting automatically.
2.Click Start, and then click Run.
3.In the Open box, type sfc, and then click OK.
4.Click Extract one file from installation disk.
5.In the Specify the system file you would like to restore box, type the name of the missing file, and then click Start.
6.In the Restore from box, type the following line
drive:\Win98
where drive is the drive letter of the CD-ROM drive.
7.In the Save file in box, type the following line, and then click OK
drive:\Windows\System32\Drivers
where drive is the drive letter of the hard disk on which Windows 98 is installed.
8.Click OK, and then click OK again.
9.When you are prompted to restart your computer, click Yes.
There may also be other drivers missing. Repeat these steps for each missing driver.