Do I have a virus if when downloading or streaming I need to keep move the mouse to keep it going?

Hello and Welcome to the Webroot Community Forums!
 
If you suspect that you have threat:
The best thing to do is to Open a Support Ticket, and ask Webroot Support to take a look and remove this for you.  There is no charge for this if you are a WSA license holder, with a current subscription.
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Virus Removal Options
https://community.webroot.com/t5/Webroot-SecureAnywhere-Antivirus/Virus-Removal-Options/ta-p/54074

Hello jadeph,
 
Welcome to the Community Forum,
 
Depending on what browser or browsers you are using does this happen in all browsers or have you tried a different browser to see if you still have issues.
 
Please have a look at some information here, https://helpx.adobe.com/flash-player/kb/video-playback-issues.html and go here
https://forums.adobe.com/thread/1081842 and here is one in some help on the FF help site.https://support.mozilla.org/en-US/questions/977374 
 
Also depending what browser you are using you might need to install the latest the latest Adobe FlashPlayer and the latest version of FF and Chrome has it own flashplayer installed.
 
Make sure you uncheck any addons with the install of Adobe Flasher Player
 
If you still have problems then please submit that support ticket that Petr has advised.
 
Hope this helps!
 
Kind Regards