I had some viruses on my laptop so I downloaded AVG's free anti virus program to try to get rid of them. At the same time I was offered a free trial of their PC Tune Up program. It promised to speed up my computer, so i decided to download the two programs simultaneously. The laptop had been quite fast originally, in spite of the viruses, but since installing Tune Up, it became unbearably slow and impossible to use. Even the smallest task takes forever. It takes around 25 minutes to boot up (when it previously took 5) and it shows high memory usage (over 100MB) in internet explorer even when I am not doing anything! Task Manager (when I can open it at all) constantly shows between 65 and 100% CPU is being used, when just one window is open at Google. the thing is that only half of my memory is taken up as I barely have any programs installed. Just asking Internet Explorer to open can take 15 minutes and closing the page can take several minutes too. Once I'm on the internet, it can access some pages for a few minutes before freezing up and not responding again. On some pages, pictures will not download. I tried to restore my system to a point before Tune Up was installed, but the viruses I had seem to have deleted my restore points. I then uninstalled Tune Up which made it slightly better but not much. Thanks to Malwarebytes and AVG, my viruses are mostly gone (although there are a couple that can't be fixed), my computer is unbearably slow and I can only assume that Tune Up has messed up the registry. I did not imagine that a trusted brand that promised to speed my computer up would actually do the opposite and make it unusable. Ironically even in its previous state with viruses on it, my laptop was much faster than it is now. I was getting rid of the viruses for security reasons and not speed.
Is there anything I can do (other than a complete reinstall of Windows) that would restore my computer to a normal speed? Should I uninstall AVG's antivirus program too in case that is part of the problem (it was downloaded at same time as Tune Up and before that everything was working fine)? Your help would be hugely appreciated as I am beside myself with a laptop I cannot use. Thank you.