CPU spike then crash. Win7 Dell Laptop 6400

Hi, IT support just re imaged my laptop but problem persists. Every day I have a CPU spike around 3pm.
Nothing is running that I can see. Spike renders my taskmanager not able to come up and entire session goes kaput on the wireless connection.
I hard boot and restart in dock station/LAN connect. All is well. What might be the problem?
Any ideas would be helpful since now with re image I have time to re install everything these baboons thought the reimage would fix.
