Write-protected USB port

Guys

I am having a big problem on my machine and I dont know how to solve it. Something must have messed up my USB port connections because everytime I try to transfer a file from my computer to a USB memory stick (and I have tried 5 different ones), I get an error message saying that the disk (of the USB stick) is write-protected. I can read and see all files of every USB stick I plug in and it is recognised OK, but when it comes to file transfer or deleting files on the USB stick, I get this really stange error message ... any help, toughts, advice are kindly appreciated.

 

Steve

I dont have such an option when I do a right click (I know what you mean though, but there is no such option I had a good look through all the tabs available when I right-clicked on the drive icon) ... since the USB port seems to work otherwise (ie recognising any USB device I am plugging in), it looks more like a software problem to me (ie that a software "blocks" write access to USB memory stick devices) ... any other ideas/suggestions ... dont really want to re-install Windows if I can help it otherwise.

Thanks