Loading crudware gums up the system. With tens of millions of crappy Win32 apps over >30 years, most users don't have a clue about what goes on underneath, and how lousy apps, drivers, thunked middleware, and lousy firmware in subsystems screw up the tubing.
Get control of your system and it should run pretty much without issue for years and years, especially since Vista (Win 7 is just a slightly tweaked Vista).
Msft has been trying for years to deprecate Win 32, because it's open and comes from the days before malware, so vulnerable to both badly-written apps and badware that can stomp over the system. But the market won't budge because of the millions of legacy Win32 apps. Between rock and hard place, and Windows always picks up the blame.