Well, first, don't break it, send it away, to me!
Really, it is not the computer by itself, most probably the Vista OS, if you can get a copy of WinXP try to install it and then see if that fixes everything, also, if you are able to do a clean install of Vista, don't install all the extra software that comes with your laptop, instead, just install the OS and then see if it works ok, then just install what you really need, this means, nothing from the original cds, download firefox/chrome, use that for browsing, and get free applications from the web, open source of at least things like winamp or similars.
Media player classic for video/dvd/divx, Firefox/Chrome for web browsing, winamp for mp3 player/ipod/whatever.
Chances are that some big dumb software was installed by default on your pc and is taking all the system resources by using a background task, some service that you may never really need but it was installed anyway.
If nothing works, then install XP and try again, if that still doesn't work, then use Linux, if also that doesn't work, then you know what to do
Get a Mac next time



