HTC G1 "scan memory card 2 gb" Questions

...card but it doesnt display. When I connect the handset to the PC through a USB cable it doesnt show up. you need to reset memory card settings. scan your memory card with an antivirus. format

...memory card? My micro sd card is not being formatted by my phone nor my computer. Ive been to disk manager and it recognizes the disk drive but says that the card is unreadable. What should i do to ...