If you know the Lambda is to blame, then why have you not replaced it with a better interface that will not cause crashes and glitches in the computer? Most crashes are related in some way to the drivers used by a particular program or app.
A decent interface on the old computer would have made a big difference. I ran my Saffire Focusrite on a duo core Dell with Vista as the OS. For the most part, considering it was an off the shelf machine, it ran well.
On my custom build it runs flawlessly 99.99% of the time. Rare thing to get a crash. It's usually a self inflicted crash when it does crash.
Why it happens? I've heard for many years that the Lambda interfaces use some sort of codec as a driver and are problematic as a result.They don't, correct me if I'm wrong, use true ASIO. I browsed the owners manual PDF looking for driver info and did not see any mention of the specific drivers other than to "load the USB drivers" provided.... maybe I missed where it said they do use ASIO.
So, yeah, pick up a Presonus, M-Audio, Focusrite, or Roland interface and sell the Lambda on Ebay.