The recent dustup over Lenovo installing adware/malware on new consumer-grade computershas renewed attention on just how much crappy bloatware and trialware (trial versions of programs) is loaded onto Windows PCs by manufacturers. Lenovo is not the only offender. Dell, HP, Asus, Acer, Toshiba, and others do the same thing. Windows might have more fans if, like Mac OS X, all users were given a clean Windows install without crapware slowing down (or potentially compromising) their machines. Other than going the custom-built route, the only way to get a "pure" Windows machine is to buy a Signature Editioncomputer directly from Microsoft.
If it is too late for that and you already have your computer complete with oodles of crapware, there are ways to help restore Windows to its intended state. As suggested by Rod Trent at the always useful SuperSite for Windows, there are three utilities that work well. Trent recommends:
All have free and paid (premium) versions. For most users, the free version should work well enough on a single PC.