I know my computer stopped working 'perfectly' while I was on this board the beginning of Feb. I clicked on a link in one of the posts to a site that I had been on many many times. I know I should have typed in the site myself but out of habit I clicked on it. Should never have done that! Computer full of trogans. I cannot remember which post it was. I wish I could. I replied to a post about this before-I did not have my Kaspersky update loaded yet and was using Microsoft Essentials only. I never had a problem when using Kaspersky. I have not had any problems since I reformatted my computer, updated everything all over again, installed the newest version of Kaspersky and made sure ccleaner was working correctly.
Also-I made sure over the years to delete the older version of IE before updated to the newest version. Made a big difference in how 'fast' things worked.