I have tried to set this on my WDR4900 and it seems to work. You can try. First tick "Deny the packets specified by any enabled......router" Then add a rule. Host : Mac address of my computer...

That depends on what you need, if you just need WIFI, you can totally get a low-end router like WR741ND. If you need USB sharing ,you can buy a WR1043ND, if your router is equipped with dual-band...

It's probably the TP-LINK security mechanism that caused this problem. Their firmware all updated lately with improved security. You may try to downgrade your firmware to a older version to check if...

I believe I gave suggestions in your another identical thread

Here's my suggestion, turn off the power safe mode on your computer, or you can go to your retailer for a change .

According to their Win8 compatibility list , it is compatible. You can try to use different PCI slot to install the adapter. http://www.tp-link.com/common/promo/en/win8compatibility/