Not to be mean or anything, but the person who told you to do that had no idea what they were talking about. While that would technically work, it's a horribly inefficient way to do things... I hate dual boot systems because you have to install everything twice, you divide up your HD space, and finally booting the computer takes longer and is no longer something you can walk away from. The only time it's really worth doing a dual boot is if you want to do a thorough test of a new operating system without committing yourself to it...
Even switching to a dual boot configuration is a serious PITA because it either involves resizing the partition you've got now to free up space for the new OS (Which is a somewhat precarious, lengthy, and tricky process that requires special software, and I have yet to see a freeware program that will do it.) or completely wiping your hard drive and starting over, which has its obvious disadvantages.
Lucky for you there's a muuuuuuuuch better way... 🙂
There are only really two things you can do to make your computer run faster without installing new hardware -- Defrag, and clean out your startup folder. When it comes to defragging, the windows stock defrag utility kinda sucks. It puts individual files together, but makes no effort to sort files or place them in a way that will help them read faster. Look into a program like Ultimate Defrag, or a freeware equivalent.
Cleaning out your startup folder is pretty easy -- hit start, run, and type "msconfig" (without the quotes). Go to the startup tab and hit "disable all". Then go back through that list and turn on your antivirus, anything by nVidia, AMD, Intel, or ATI, and anything else you specifically want to run on startup. You can't break your computer turning things off here; nothing that is system critical shows up in this list. You can always come back and turn things back on too... Google's your friend here 🙂
Just FYI, 99% of programs that put stuff in your startup folder (iTunes for example) don't need that item activated to work properly. You probably won't even notice a difference when using those programs.
Oh, and if you're using norton antivirus get rid of it and pick up Avast. Norton is awful about using up system resources...
Hope this helps 😀