I would just stop them from starting up. Leave them installed, and occasionally run them to keep them updated. Superantispyware and Malwarebytes' Anti-Malware are good tools that scan quickly. Spybot's Teatimer does a good job for real time monitoring. I am not real familiar with Spyware Doctor so I will not say either way for that. To the best of my knowledge all of these programs will work well on your system, and keeping one real time monitor is recommended, so it is your choice.