Unless someone corrects me, I think the Kernel power message is the result and not the cause of the problem.
Have you tried running the system with the case open in case it is a heat problem?
Are internet applications the only ones causing problems? Have you tried turning the network adapter off in the bios or disabling it in the Device Manager to test? Are your firewall/anti-virus programs compatible with Win 7?
Have you run any memory tests? Does Event Viewer Show any other Errors or Warnings that might indicate problems?
If you run msinfo32.exe and check for problem devices under the Componets section, does anything show up there?
And I think, but not sure someone was having a problem with a power supply and possibly it was a Corsair--something about it not being compatible with a certain motherboard.
Operating System Win 7 x64
Computer Type Homebuilt
OS Service Pack 2
DirectX Version 11
CPU Type and Speed i7 3770K
Motherboard Chipset Asus P8Z77-V Pro
System Memory Type 16 GB Kingston
Video Card Type and Speed Nvidia GTX 680 (2)
Computer Monitor LG 27" (3)
Hard Drive Kingston 240 SSD
Optical Drives LG WH12LS30 Blu-
Modem-Router Type Linksys E3000
Network Adapter Intel Gigabit
Anti-virus Software MSE
Computer Skill Level Average Ability
Windows Experience Index 7.7