I may have found something that will tell us more, problem is I've never used it so you'll have to trust Microsoft's instructions on it. Follow the instructions from this link and paste the log in your next post :
http://support.microsoft.com/kb/q177415/
Also, what antivirus and firewall are you using ? Could you disconnect from the internet for a while (unplug the ethernet cable if you're on a wired network, right-click the wireless icon and click deactivate if you're on a wireless one), deactivate your antivirus and firewall and report whether the kernel memory keeps increasing while the firewall and antivirus are off.