Advanced Vista Optimizer 2009 offers a comprehensive set of tools for doing everything from optimising your CPU and memory to better managing programs that launch at startup, to cleaning junk files, protecting your privacy, and more.
All the modules are well-designed and simple enough to use so that you don't need to be an expert to take full advantage of them. Advanced Vista Optimizer 2009 takes a wizard-like approach to system cleanup and optimisation, clearly walking you through each step.
Advanced Vista Optimizer 2009 also includes a nice single-click care feature that scans your system for problems and speedups, and then does them all for you automatically.
There's only one drawback to this program: its price. At nearly £25, it's not cheap. Some free programs - such as Advanced SystemCare Free - perform similar tasks, although they don't offer as comprehensive a set of tools as does Advanced Vista Optimizer 2009.