Help and also a warning.

[N-gage noob]

Today i was mucking around with my n-gage and decided to format my 128mmc card through windows whilst the n-gage was hooked up via the cable.I then put a few mp3's on there and proceeded to unhook my N-gage via stopping the device through windows not just pulling the lead out.
Tried to listen to my mp3's on the n-gage and gave me a corrupt mem card warning.So i thought i would re format using the n-gage,no probs.Now when i hook the n-gage to the p.c the pc wont see the mem card (device doesnt show) although the n-gage can see and use the card fine.
Tried the same thing on and old 16mb card and samething happens.Am i doing something wrong?If i'm not dont be tempted to re-format using windows people.P.s would a card reader see the card now as i cant access it using my pc and supplied cable now?

[N-gage noob]

Update:
I have just bought a mmc card reader and that picks up the files on the mmc card fine.But the pc still wont detect my n-gage if i link up with the n-gage cable but the n-gage can see the mmc card and use it no probs gggrrrrr!
The pc has no probs seeing my other mmc card that is in the n-gage so it looks like when i fomatted the other card using my pc when linked to the n-gage it did something strange.
No matter how i format the card now ie in the card reader or in the n-gage my pc cant see it when i hook the n-gage up to the pc.
Any advise anyone on getting this card visible to my pc again using the supplied n-gage cable?