Two wifi network with two dongles on 1 PC

Good evening!

I just changed my router and my wireless key from G to N and WEP to WAP. (D-Link)
Problem is my DS cannot connect any more to my network. It is, I can put the WPA key, it connects then loses the connection.

What can I do to have two Wifi dongles on the same PC and create a Wifi "Stand alone" (which is not going to connect to my router)?

Thank you

Try disabling the n, if n is enabled in my router, I have access via my mobile phone in wifi b or g.

You can make one machine into a wireless gateway that other machines could connect to. Though I have never done it or had the need to do it I do know it is very possible.

Run the cards in Ad Hoc. I don't remember you mentioning internet connectivity and you certainly don't need the internet to have a LAN (network) but if you do want internet as part of the equation then one workstation would have to be the host and running all the time. You'd then use something like Windows ICS or third party Proxy/Nat solution to share out your internet connection.

If you have connectivity issues...

1) Try to use 802.11a or 802.11n at 5GHz. Less competition there than at 2.4GHz, which is what most people use. 2.4GHz also has only a small number of available channels, but 5GHz has a ton.
2) Using 802.11n gets you MIMO == better reception in adverse situations.
3) Try to use a WiFi base station with an antenna jack or jacks, and use an external antenna.

#3 should be reserved if #1 and #2 don't work out for you. It's also the most expensive.