lansweeper is on 443, IIS Express I don't know since it's installed by the beta installer. Anyway, there seems to be a misconfiguration in there.
I see that in IISExpress..config:
<sites>
<site name="Lansweeper" id="1" serverAutoStart="true">
<application path="/" applicationPool="Clr2ClassicAppPool">
<virtualDirectory path="/" physicalPath="C:\Program Files\Lansweeper\website" />
</application>
<bindings>
<binding protocol="http" bindingInformation="*:80:" />
</bindings>
</site>