Hi Max,
SyncHost.exe may be a virus. EXE ("executable") files are files that contain step-by-step instructions that a computer follows to carry out a function.
To be on the safe side, we recommend that you scan your PC by downloading Microsoft Safety Scanner. It is a free downloadable security tool that provides on-demand scanning and helps remove viruses, spyware, and other malicious software.
We're here if you have more queries