Wired connection to W8961N works OK? How many wireless clients are connected at the same time? Try different channels and channel widht 20MHz. Disable UPnP.

The same model? Hardware version and firmware version? What you've done? Don't describe a problem in such a simple way on the forum...:)

Did you install the driver of printer on your Windows 7? Connecting the printer directly to Windows 7 PC, can you print? Can you ping printer's IP successfully on your WIndows 7? You may try to add a...

If you have upgraded the latest firmware, you can also follow the guide to change some settings. It should be secure enough. No worries. http://www.tp-link.com/en/faq-573.html As you said, "I have...

Bypassing powerline adapters, did you test if there is any problem when two PCs or more are connected to the switch? Homehub 5(LAN)----(LAN)Switch(LANs)----PC1 & PC2... Another set of plugs are also...

That's how it works there is no settings to avoid it.