Another option for Windows Vista users experiencing lag spikes every 60 seconds is WLAN Optimizer. The software was released in 2007 as an alpha version and is no longer being maintained.
What is WLAN Optimizer?
– A small freeware tool for Windows Vista disabling the periodical background scan activity for wireless networks, thus improving latency time of wireless connections, since the background scan can cause major lag on some systems as you can see in the screenshot below.
It can be useful for people with wireless connections getting lag spikes (especially during online gaming, audio and video streaming).
The application automatically tries to optimize your wireless connection when started. If it works for you, you can make it launch when Windows session starts (e. g. minimized to tray). Closing WLAN Optimizer will restore Windows standard values.