MY MICRO SD:Infected?

was too lazy to post this a month ago(thats when it happened)
well i inserted my sd into the usb and i plugged it in the computer
then when i go to copy JUS(was just going to x2 click my computer. was gonna give it to a friend) everything went real slow. like a semi hang
so i couldnt get a safely remove usb device. i turn it off(im not really a tech guy so it was really stupid of me to think that taking off the usb even while the pc is turned off would destroy my files. yes really stupid)
so i turn the pc on and get this blue windows screen with some bla bla and i see save lost files into files or something like that(cant remember was a month ago when this happened)cause i dont know what to click i didnt click anything
then when i got into my profile everything was still really slow and i check my usb in my computer and theres NOTHING
everything was erased except for a USB$@!(or other symbols) file
i remove the usb and everything goes normal again(which is why i didnt consider my pc having a virus)
then i thought what if i use another pc(i used a laptop)
so i plug the usb in the laptop and everythings normal. loaded some old games in my micro sd and i still had the update version
so now to get games to my ds i dl it here in my pc transfer it to an mp3 then plug the mp3 in the laptop plug my usb then swap it
so what do i do?(anand dont take our argument over roms personally and help me out)

Run chkdsk.

Replying to #2

whats a chkdsk

windows XP disk checker

It should be in one of the menus in Properties of your MicroSD. Most people know what chkdsk is from the green screens etc. they get at startup on XP etc.

I think it hangs because of the USB ports. My dad had this problem. He inserted a USB flash drive into his PC and the computer went REALLY slow. He ran task manager and discovered that there was a process (can't remember which one) that was taking up 98% of his CPU. He plugged the same memory stick into the rear PC USB ports and it ran normally. I think it's a Motherboard problem. If it continues to happen you might either:-
A) forget about using those USB ports
or
B) Contact the PC manufacturer and tell them about the problem.Well hope this helps