blib:
Hello and welcome to the forums.
You might try checking with the manufacturer of your wireless router to determine if there is a firmware update available. Typically when this type of problem occurs if you open the network and sharing center and click on the red x either between your gateway and the internet globe or between you computer and the gateway to invoke the troubleshooter, you will ususally get a response indicating an issue with communicating or connecting to the default gateway or words to that effect, so you may want to establish whether or not, when the problem is present, if you can ping the inside edge of the router and open the routers web interface.
You can and probably should experiment with different channels on the router depending on the selections available change it from whatever to 3 and if that doesn't improve the issue change it to 11 and if that doesnt help, pick something near the middle say 6.
Is the other Win7 machine that seems to work well with the adapter installed also running the 64bit version of Windows 7?
You don't mention the Rev.# (Revision number) of the dwa 130, but for instance the Rev E version of that particular device I believe uses the Realtek 8192su chipset and you might be better off trying the actual realtek driver which is newer by more than a year than the one available through D-Link for the same Rev E model.
As an example
Code:
Dlink Drivers
net8192su.cat 10/8/2009
net8192su.inf 10/2/2009
rtl8192su.sys 8/20/2009
RealTek Drivers
net8192su.cat 12/13/2010
net8192su.inf 12/10/2010
rtl8192su.sys 11/25/2010
Also you need to consider proximity as well as potential interference from other devices, cordless phones, neighbors wireless, etc.
And while you're at it you should also try temporarily adding wireless security to the router, try WPA and an easy password phrase like P@$$w0rd or Phr@$e just to see if that helps change up things. Usually adding encryption generally adds a bit of overhead so it may not help but it never hurts to try. Just to see if you can move the diagnostic process off the zero mark.
Keep us posted
Regards
Randy