Enable DMA for all ATA/ATAPI drives in the Device Manager(almost every new HardDisk and CD-ROM supports DMA)

ON WINDOWS 98 IT IS DONE LIKE THIS:
Control Panel -> System -> Device Manager -> Disk Drives -> your HardDisk Properties -> Settings (check DMA=on)

In Win 2K

Start >control panel >system > hardware >device manager > IDE/ATA ATAPI controller > Then Primary OR secondary IDE channel >Properies >Then the same as win 98

disable auto-insert notification for all CD-ROMs and other removable media

ON WINDOWS 98 IT IS DONE LIKE THIS:
Control Panel -> System -> Device Manager -> CD-ROM -> your CD-ROM Properties -> Settings (check AutoInsert Notification=off)

In Win 2K

Start >Run >type "gpedit.msc" {enter}
Navigate to Computer Configuration >Administrative Templates >System.
Locate the entry for Turn autoplay off