windows 98

go to start run
type command.com enter
type dir mscdex.exe /s/p/w/a
note down the exact location of the file mscdex.exe
after you locate the files mscdex.exe and oakcdrom.sys
type edit autoexec.bat
type c:\(file location)\mscdex.exe/d:mscd000
save the file in the autoexec.bat
at c prompt type edit config.sys
type device=c:\(file location)\oakcdrom.sys/d:mscd000
save the file
reboot the computer