In very rare Windows 8.1 environments a BSOD crash (Blue Screen of Death) can happen upon connect. 
Such a system crash is always recoverable because the driver is not yet active during Windows 8.1 system boot time.
Just reboot the primary machine in safemode then uninstall the spacedesk driver. 
To boot in safemode, press and hold f8 key upon computer reboot and before the windows logo appeared.
Then in advanced boot option screen use the arrow keys to select the safe mode option then press Enter key.


Note: Before uninstalling using the spacedesk msi installer on safemode, run a Command Prompt then type the following commands:

Step 1:
for Safemode: REG ADD “HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot\Minimal\MSIServer” /VE /T REG_SZ /F /D “Service”
for Safemode with Network: REG ADD “HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot\Network\MSIServer” /VE /T REG_SZ /F /D “Service”

Step 2: 
net start msiserver