Psikey.dll is a legitimate Windows DLL file installed by CorelDRAW Graphics Suite X7. Its primary functions are:
The file is typically located in:
C:\Program Files\Corel\CorelDRAW Graphics Suite X7\
or
C:\Program Files (x86)\Corel\CorelDRAW Graphics Suite X7\
If you see ransomware notes (e.g., .encrypted files), wipe the drive and restore from a backup made before the infection. Corel Draw X7 Psikey.dll File
If the Repair function fails, a complete clean install is the next best step. Psikey