Ctrl + Click + Drag Deselects Selected Items and System Folders Have a Tag

Just like the title says, recently I've been noticing that when I'm selecting a group of items in a folder if I select some and click and drag over them again it deselects them. This never never happened before a couple weeks ago.

I believe it started when I had an IT guy do a checkup on my PC. My System folders also have an aoying tag that says "System Folder" now but that can be easily overlooked.

Examples: http://prntscr.com/cax3uc http://prntscr.com/cax3xp

P.S: Never letting an IT guy touch my computer again unless it's something really serious, they always mess with something I don't want to be messed with