You obviously can not computer. Please mail me the offending SD cards, your PC, and any computer like objects in your home. They will be put to proper use in an environment where people who know how to computer can operate them.
If this does not seem to be a reliable solution, try this:
Use the SD card on another device to see if this next device, such as a friends PC, also states the same thing, you may have either a faulty card, or you have no idea what you are doing.