8 GB card is not readable by any of the PC. Firstly i thought virus attack but with that too i need it to be readable. What to do?
What type of memory card is it? Your question is too vague to answer conclusively. If you mean to say SD-Card then you should ensure that you say that instead of just "memory card". Please reply back for a possible resolution to your problem.
Try the card on another reader/pc. If it shows up you can try recover the data. Else I don't think it would be an easy way out.