No, it is Vista's internal wireless utility.
Run your set up program that came with the router, and make sure you have entered or clicked the required buttons for auto setup of the routers address. If I recall, it is the very first option, and you click Auto DCH or something with a "D" as the option.
I manually set the router up by accessing it's http server via it's IP address. I can assure you that DHCP is running perfectly, SSID is being transmitted, and I have eliminated it as an issue by setting the Vista box up temporarily with a fixed IP, with no change in the problem's occurrence. I am quite competent regarding most router setups, and particularly linksys, as it is my house brand.
I had this happen once on a laptop and it turned out to be a bad antennae. I had to purchase a new wireless card for the external slot.
My other two laptops are XP and use the router via air with no troubles. It is definitely the Vista box. I had returned my original Vista (Acer) laptop over this issue, but the new one does the same thing. I also have the same problem in the field with other networks and other Vista based laptops. It is something in the OS.
It is a irritation, resetting the router all the time, but is not an ordeal. It happens intermittently across a day or two. I will figure it out. I just have to take the time to de-DMZ my nix server and sniff the local side of the network with that to see what the Vista box is doing in order to prove it.
I have a ACER 5610z...............
Yeah, that's about the time it takes for the router default timer to time out.
My ACER came with a suite of programs called Empowering technology. One of those progs is a utility to organize and maintain connections of all kinds. It works well and gives you a lot of easy control.
If you don't have it, it is on the ACER driver site, and you might try itif they have it for your particular model and sn.. I have no other ideas at this time, and really am stumped as to why it will not maintain.
I have a XP machine that did something very similar, and I tried everything to get it to work. I never found it, and one day I simply deleted the linksys apps and the connection and started over. This time I went from the standard 16bit security to the 26 digit 128 bit WEP and the problem miraculously went away. I know I had tried this before, but I never went to the 128 bit. We have a dozen or so networks in range, and I suspected that there was some sort of interference. This computer is at the other end of my house and seems to recieve more signals from other sources. But I am not sure.
I don't know what you are currently using,but I thought this might be pertinent to the problem.