A: This is almost certainly due to an antivirus update. Your antivirus software updates its virus definitions regularly. A new update may have been released that now flags the rld.dll file as a threat, causing the program to quarantine or delete it immediately, even if it was previously untouched for months.
The game lacks the permissions needed to "read" the library file. Windows Defender: the dynamic library rld.dll failed to load pes 2012