how can I tell if someone has mirrored my computer or remote viewed my computer

Hi baam
 
Welcome to the Community Forums.
 
Well, this is a scam if ever I heard of one and especially when one tries to go to that site one should get the following from WSA:
 

 
Goggling the telephne number suggests that it is linked to online dating scams but as for your system being mirrored I would sertioously doubt it. More likely that you have picked up a PUA (Potentially Unwanted Application) and that is the source of the problem...they are mainly linked to adware type issues.
 
If you have scanned with WSA and turned up nothing then you should be OK.
 
WSA does detect and remove many PUA's, and more are being added, but WSA does not detect all of them. A simple browser add-on with PUA behaviour that is easy to identify and easy to remove is not likely to be detected and removed by WSA. Those that are intentionally difficult to locate and remove are. Please see THIS LINK for more information regarding Webroot's stance on these annoying programs.
 
To make sure that your WSA is checking for PUA's with the best proficiently, it sometimes helps to reset the PUA detection within WSA's settings. For PUA's that had previously been scanned and determined to be OK, but have since been added to detection/removal, you may want to complete the following steps:
 

• Open Webroot SecureAnywhere
• Click on ‘Advanced Settings’ from the top right
• Select ‘Scan Settings’ from the left side
• Unselect the option “Detect Potentially Unwanted Applications”
• Click on the Save button (you may have to enter in a CAPTCHA)
• Reselect the option to “Detect Potentially Unwanted Applications”
• Click on the Save button
• Run another scan with Webroot and remove any items that get detected.

If still concerned after a scan then the best thing to do is to Open a Support Ticket & ask Webroot Support to take a look for you.  There is NO CHARGE for this for valid WSA license holder.
 
Regards, Baldrick