Sorry,, but I have to disagree......I always partition my hard drive into at least two separate partitions,
I install my 3rd party apps on the D: drive so Windows doesn't have to look through the complete partition on startup (unless there is a program that runs at startup on the D: drive.
I keep a second drive for all my important Documents=, Music, Video, and backups
Other partitions double you wasted space, I don't quite understand that one.
I only use the operating system. I do not use any Microsoft apps besides WMP on occasion.
I prefer freeware and open source software as it's constantly updated and improved.
Does Microsoft dothid...no, they just issue Service Packs for the entire OS.