If you are in a game or 3D enviroment and it starts artifacting and the drivers crash and recover and you have a Logitech webcam installed the program may cause he issues.  Disable the LVPrcSrv.exe and LVPrS64H.exe from starting.  You can do this by going to to the run command in the start menu and typing msconfg.  Then click the Startup tab.  All programs that will start when windows start.  Find these two programs and uncheck them then click apply.  It will require a restart for this to take affect.  When it restarts it will have a message saying that the startup programs have change.  Check the box that says hid this on startup and it will not show again.