Hello MD469, welcome to the Microsoft community, I'll be happy to help you today;
I understand that you are unable to remove the Adobe-related CoreSync_x64.dll file;
Initially I recommend that you press the Windows key and type: msconfig press Enter;
On the startup tab, disable anything related to Adobe, especially Adobe Creative Cloud and Adobe Updater. Acrotray is also part of Adobe's boot sequence, disable that too;
Restart the PC. Go to the CoreSync_x64.dll location and you still will NOT be able to delete the file, but you can rename it. Rename it to any name;
Restart PC again, go to CoreSync_x64.dll location, now you can delete files and folders;
Hope this helps, see you soon!