Because of all the preloaded software. It increases the load of the CPU and memory usage, causing you machine to use more energy. Some programs are more demanding than others, using more energy. Many of the HP preloaded applications are redundant, for instance, the wireless assistant. The wireless assistant does nothing but duplicate the same set of options already available through windows UI. HP power assistant is almost as useless unless you are NOT already running a seperate power/battery consumption monitor, such as Batterybar (A personal favorite btw) The only HP applications I would suggest you keep are the security manager (For use of the biometric device and HP spare key, amung other security tools) and HP support assitant (For automatic updating of drivers, but even this I would suggest you only activate manually and only once a month) Aside from those, as long as all of your drivers are up to date (Which can be accomplished after a fresh install by means which I will post in the new user thread later) and you are familiar enough with the UI of your version of windows (hopefully win7) to be able to access the features and controls you want.... There's no need to keep almost any of that stuff.