There are a couple of things that you can try :
-Try to open the tray menu and restart the Bot Manager component Also check that the port 15444 is open.
-Stop 'Jenkins' Service which is running in the background by stopping it from the 'Component Services' option. (Search it using the Windows button)
-Stop all 'Java' processes and then install Workfusion RPA Express. Start this program as well, and then restart all your stopped Java processes
You can check out this link for troubleshooting:- https://kb.workfusion.com/display/RPAe/Troubleshooting