I should mention that the Slingbox connects to the WLAN via a wireless bridge, which talks to the (one and only) Linksys wireless router.
The laptop in question connects directly to the Linksys router, not to the bridge.
Last week when the laptop was working, it could detect the Slingbox on the home network. Yesterday, post infection, it could not find the Slingbox on the home network.
Slingbox is on, with both red lights showing. We cycled the power on it, the bridge, the Linksys, and the cable modem several times.
The laptop can ping the Linksys and the cable modem. It cannot ping the Slingbox.
We eventually got things working again by doing a system restore and uninstalling McAfee from the laptop. Then a hard reset of the Slingbox made it detectable again. We did the Slingbox setup from the laptop, and now we can watch TV online.
I think the Win 7 malware did something to the laptop, which also interfered with the Slingbox. I just don't understand how.
I understand that you want to know why the Slingbox stopped working and started to work as soon as you uninstalled the security software.
Most of the times, the security software will block the connection between the Slingbox and the home network, even if the Slingbox shows solid lights. The following link will provide you with some information that might help you.