If you think this is a driver issue, please try Where do we see SolidConverterPDFService圆4.exe ? Let try to run a system scan with Speed Up My PC to see any error, then you can do some other troubleshooting steps.
What can you do to fix SolidConverterPDFService圆4.exe ? If you encounter difficulties with SolidConverterPDFService圆4.exe, you can uninstall the associated program (Start > Control Panel > Add/Remove programs How to remove SolidConverterPDFService圆4.exe Let try the program named DriverIdentifier to see if it helps.
Is SolidConverterPDFService圆4.exe using too much CPU or memory ? It's probably your file has been infected with a virus. Something wrong with SolidConverterPDFService圆4.exe ?