You get to install software such as WinDVD, PowerDVD or other. It's not free and confuses some that DVD playback is not a feature in this OS.
I recently acquired an HP Omnibook 6100 with a cd-rw dvd rom. It had no operating system due to a hard drive replacement, so I installed a legal copy of Windows 98 SE. I've done all the upgrades thru MS and the unit works fine, except that it won't play a DVD. I know the unit works because it plays CD's and writes to CD's just fine. It appears the drive is a Toshiba. Help.