Why cant I delete pics

For some reason something has changed that I cant delete pics off of my SD cards when I put them in my laptop. I have a Sony VPCS111FM laptop running Windows 7. My built in card reader has suddenly changed that I cant delete anything off of ANY SD card I put in it. It was working fine and I dont know what has happened. It wont let me add anything onto an SD card using the built in card reader. I know its not the cards, they woeked in another pc and I plugged in an external card reader and that worked fine. Ive tried everything I could find but cant figure what happened and how to fix it. PLEEEASE HELP Confused

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