First thing to try:
Right-click the WireShare installer and then click Run as Administrator.
Does this fix the issue? If not then see below:

1. Open the Control Panel and choose Uninstall a Program. Select WireShare and proceed.

2. Download and install CCleaner (free). Do a clean, then click the Registry tab to use that function. CCleaner can be trusted and we have recommended it for almost 15 years. The Registry is where installation issues often occur. An alternative or second option is microsoft.support: Fix problems that block programs being installed/removed (Windows 7 to 10 only.)

3. Install WireShare via 'Run as Administrator'.