Patience. or however the hel you spell it.
Look at this thread and see if any of it helps you out. Check out the first post (Greg's on page 7), and remember to thank Gregrocker, as he has done a lot to help us in these areas: Computer lags every couple seconds
You do not have to do this bit right here, it is just an option: Unless you are paying for an antivirus, uninstall all antiviruses you have and install this single antivirus (along with malwarebytes, as Greg mentioned above): Virus, Spyware & Malware Protection | Microsoft Security Essentials
(Malwarebytes: Malwarebytes : Free anti-malware, anti-virus and spyware removal download
Defragement every hard disk drive that is not a solid state drive. do a disk cleanup of your main hard drive and delete everything you don't want. it is possible you have installed something that is slowing down your computer. As Greg suggested, make sure you do not have too many startup items when you turn on your computer. let me know if any of this solves your problem. if not, I'll help you further. reply back