An alternative approach would be to use a 'live' version of Linux to see if you can get the data off these memory sticks. 'Live' because you don't install it on your computer, you load it off a USB stick and it runs entirely in RAM. This is a very effective technique if only because Linux pays no attention whatsoever to Windows permissions !
Have a look at this thread from the Linux section, I think it includes all the links and advice you will require -
Mint is a very good and quite easy to use OS and - so long as you do not click the 'Install' button on the desktop - there is no risk of turning your computer into a Linux box ! Once you have the OS on a memory stick and booted the computer you should be able to see these questionable drives and their data, and then copy them to some known reliable storage. Then shut down the computer, remove the memory stick with Mint on it, and re-boot. You will be back in Windows and then be able to check if you can now use these files.