I have a HP laptop running with Windows 7. I have had ESET loaded for many years without a problem. Last week a window popped up offering me “extra features” which I downloaded on 17th August. The following morning the laptop failed to start properly and then ground to a standstill. After performing “System Restore” I was back in business. I then uninstalled ESET and defragged. Still OK. Some days later I reinstalled ESET only to have the computer slow and fail when I tried to activate the licence key. Only System Restore has got me back in business. There is over 400Gb of free disc space.Please advise on resolving this problem.