This is Windows 95/98. Not Windows XP or PC Hardware.
Most likely solution: buy a new diskette drive. You can exclude any software issue by setting the BIOS to boot from A: and put in a bootable diskette (such as comes with Windows 98).
I have a frankensystem running a 1.8 ghz celeron, on a Intel GLVA 478 pin entry-level motherboard. New antec power supply. Generic sound card.Geforce 128 PCI graphix card. Memorex dvd RW. Running XP with Sp2. XP recognizes the floppy drive and indicates that it is working properly. the drivers are current. When I insert any floppy I get the "please insert disk into a: drive" message. Even stranger is that a family member has a floppy disk that doesn't work either. We swapped files a while back. Any channce this is a virus? I have Norton running with all online updates, so i'm sceptical that a virus is to blame, but no other guesses. Any ideas cnet forum?