stlport64.5.2.dll

Hey Bertie

stlport64 version 5.2.dll seems to be referring to the Standard Template Library
which can be partly included with C++ redistributables.

I assume that the message you are receiving refers to a 64 bit download (stlport64),
the 5.2 would be the version number and the dll meaning that it is a library file.

Not sure how you would be able to fix that unless you check your Windows Updates and get an update
download prompt for a Visual C++ update. It's not a real good idea to go uninstalling and reinstalling the Visuall C++ package/s on your machine which you will find in Programs and Features so failing the update method I would be looking at maybe uninstalling the Acronis software, roll back the system with a restore point and then checking for Windows updates and reinstalling the Acronis software in that order.

In some circumstances the problem may relate to a virus/ malware in which case I would disable your current antivirus, download/ install and run MalwareBytes and see if it picks anything up.

You may also like to try running system file checker using the following command from an elevated command prompt:

Windows Orb (Start button)
All Programs
Accessories
Right Click Command Prompt
Run As Admin
Type the following: sfc/ scannow
(See this link for more details: SFC /SCANNOW Command - System File Checker)
See if this picks up any system file errors and go from there

Hope this may be of some help
Cheers :)