I needed to download Microsoft on my computer I was told a website could log into your computer and do it for you ... long story short they logged on did not install it and now in my disk utility it says I have 67,907 folders and 260,965 files my icloud is also full which cant be right because I barely use the compeer. I was told I need to completely wipe out my MacBookAir and went to Disk Utility and erased but it still says I have all these files and folders ... I also see where some people say you need some type of Disk USB drive in order to wipe out the computer ???? My Mac Air did not come with any USB in the box I bought it last year .... Could someone please advise me on what to do