I have notice a very severe nonpaged kernel memory leak in netio.sys when nod32 v4 is installed on my vista sp2 machine. I believe it also occurred when sp1 was installed, I just didn't bother investigating. I discovered that by using the windows built in driver verifier. After a day of working and some large downloads, the nonpaged kernel memory pool reaches hundreds of MBs in size when nod32 is installed. From the verifier I seen that the memory is reserved by netio.sys. And since Nod is the only net monitor software I have installed, I guessed that it's probably the cultpit. After uninstalling and reinstalling twice I can confirm that it only occurs when it is installed. I have noticed similar behaviour on my vista sp2 laptop. Has anyone noticed something like that?