I have seen, on more than one occasion, Spybot, take over a machine. Get called out as the customer think they have a virus or spyware due to machine not reacting to commands. Do a quick CTRL ALT DELETE and look at the processes tab to find spybot eating 97% of the processor. Stop the program running and everything returns to normal. Spybot may be good at detecting spyware but it will also take over the system now and again. So, if you have spybot installed and the machine is running slowly, have a look at the processes running. Chances are, spybot may be causing the problem. If it is, then its into the control panel, add/remove programs and remove it from the PC.