Hi I know this may be a bit confusing since I don't really know computer terms well. So about two months ago I noticed my computer was slowing down and then I could not get "save as", "open file", etc to pop up when I wanted them. Then eventually I could not connect to my uni internet even though I could connect to home internet. So I took my computer to my IT friend a uni and he did this reset which only erased programs. The internet worked and I downloaded malwarebytes. Then I tried to reinstall google chrome but then my computer went really weird and it hid my internet explorer and shut down options. So I scanned using malwarebytes and it picked up 200 or more problems including Trojan. The computer has been going okay since then but I have all these weird transparent icons that when I make them unhidden they say they are corrupt. So I don't know if its to do with viruses or something simple.
Any help would be appreciated, thanks.