I have a Dell Precision T5400 running windows 7 with 16gb ram, a solid state hard drive for quick start up and a regular 500gb drive for files etc. It has dual quad core processors and it used to be fast and multitask well. I think I have some unwanted programs running I can't see. Possibly malware, I don't know, it is just getting slower. Can someone help me, I have already run all my software to optimize my computer.