TS1717 iTunes will not open- please help!

My iTunes will not open.  I've tried uninstalling and reinstalling, but the same message keeps showing up when I try to open iTunes.   The error reads "C\Windows\system32\dssenh.dll is either not designed to run on Windows or it contains an error.  Try installing the program again using the original installation media or contact your system administrator or the software vendor for support."  
Please Help!!!

Taken at face value, you're having trouble with one of the Windows OS dlls associated with Cryptographic Services.
I'd first try the fixit from the following Microsoft document. (One of the things it does is reregister your copy of the dssenh.dll file.)
You cannot install some updates or programs
... but if you still get the issue, I'd try an sfc /scannow as per the instructions in the following document:
How to use the System File Checker tool to troubleshoot missing or corrupted system files on Windows Vista or on Windows 7

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