For as long as I can remember there have been websites, emails and books on various ways to optimize your version of Windows, be it through configuration changes, registry hacks or shutting down various services.
But many times over various “optimization techniques” get re-used and re-published seemingly to improve the performance of your machine yet many actually have no impact at all, a negative impact on performance or where done by users not entirely sure what they’re doing, causing total system crashes.
On How-To-Geek there’s a great article summarising and revealing some of these so called performance enhancers as myths. There’s a link in the article above to a few articles on LifeHacker with further information about this issue.
Ask around if you’re not sure before you attempt to “enhance” your machine’s performance to avoid unnecessary inconvenience.