The error message you supplied looks incorrect but is similar to what is discussed at http://www.sevenforums.com/software/238354-cannot-run-any-exe-file-side-side-configuration-incorrect.html
Before you do anything, be sure you have your files safe. That way if the OS fails altogether you can start over.
I am on Dell Inspiron 5110. Windows 7, Home Premium, Service pack 1, 64 Bit.
Long story. Will try to abbreviate.
I had a battery shut down (not connected to internet at the time), recharged battery. Connected to internet 1 day after hard battery shut down.
Computer started running very very slow. Ran Malwares, Antivirus, etc. Initiated back up via Dell services (unknowingly to the C Drive).
Computer performance improved somewhat, however I found that I was unable to open files and continued to receive a "side by side card file" error message.
I posted to geekstogo.com/forum, through a number of tests, I find that my computer is running via a copied file.
I moved that copied file (C drive: users.Paula.Paula Pc) to the external.
Since then, my external will not power down, no matter what I try. When prompted to close other applications, I receive an error message stating that windows is waiting for background programs to close.
When I view my C drive/users/paula/pc, the files are not up to date. However, when I view C/users/paula.paula-pc (the copy from the hard reboot), I can see most recent files.
I honestly believe my computer runs from the copied hard drive copy to the external hard drive. I want to be able to operate under the C drive that is present on my computer.