One Application should do it all

I am not a nerd. But use the computer a lot. Will someone tell me why I need 3 different applications for the most common use of a PC with net connection viz a separate browser, a e-mail client & a word processor. Can't one application handle this without having to launch anything. Yes, direct from the desk top. I cannot imagine something easier than that. While so much is happening in organizing my desktop and drives nobody thinks of getting started easy. For some eerie reason I am scary about desktop searches engines & disorganized or cluttered drives which people are talking about which encourages me to be more disorganized than I am today.

Another very desirable thing is tags ( and maybe sub tags ) to all my files and folders. Tags should be upto 300 character long and can hold brief descriptions about what the file / folder contain so I don't have to open each file or name them 300 character long. A separate tag search will be real cool. The Redmond monster won't listen. So it can be a separate application. (For heavens sake please don't name it Tagger.)