Good so far
I got a sd adapter with the card which enables it to be inserted into a card reader then into the pc (which you probably already knew :rolleyes:), therefore the adapter was brand new, but the card reader is quite old (Signalex if that helps), and its the first time ive used it in a while altho ive never had any bother with it before hand.
If the card reader is really old, it might have problems with larger cards inserted. I remember the internal cardreader of my old ToshÃba laptop that was not able to handle SD cards larger than 512 MB.
Perhaps it is not a bad idea to buy an inexpensive USB card reader (less than 10 EUR (or 10 USD) here in Germany) and see if things improve. Or before you span money, you may try the card (with adapter) in another computer - perhaps a computer shop will be of assistance (so they can sell you a new card reader )
Assuming the reader is the fault?
What has it done to the cards do you think?
If the card reader is faulty or (even worse) does not properly support larger cards, anything, including corruption of the card's filesystem can happen.
Will the cards possibly work in another reader considering when i put them back in the phone they were not recognised?
Well, we want to find out what is the problem source. The phone can at least format the card successfully, your computer can not, apparently. The phone should not complain if the card were properly formatted on a computer with a correctly working card reader.
Another idea: if your camera supports SD cards also - perhaps insert the card into the cam and see what happens...