You're having an issue still with the SiS software.
I don't know how successful this is going to be, but definitely give it a try.
Navigate to C:\Windows\System32\drivers and rename SiSGRV.dll to SiSGRV.BAK
If you don't fin the file there, check C:\Windows\System32 or search the entire hard drive for it.
After you rename it, reboot. If you have any problems rebooting, go to safe mode and rename it to original.