There's a lot to like about Windows 7, not least its many improvements over Vista: the new OS is faster, less demanding on resources, has better designed security and contains many new productivity-boosting features. If you were an early Windows 7 adopter, though, you may already have noticed that one old problem still remains. The more you use your PC, adding and removing applications, the more junk builds up throughout your system, and the slower and more unstable it eventually becomes. You need to treat the problem, detoxing your PC on a regular basis to remove the leftovers – but how, exactly? Which areas of Windows 7 are most susceptible to this gradual degradation? Are there any tools or benchmarks you can use to reveal problem areas? How much can all this clutter slow you down, anyway, and what's the best way to remove it all and restore your system to its optimum performance? As we researched this article, one point was clear. Windows 7 is very different internally to W...