is windows all up to date?
try downloading the drivers from click here
if windows keeps restarting then try clicking 'start/control panel/system/advanced/startup and recovery/settings' and untick 'automatically restart' now instead of a restart you should see and error, note this down and look it up in the search box click here
it may also be worth having a look in 'start/control panel/administrative tools/event viewer' click the system and application tabs and look for errors, click them for more info.
might help a bit.