I can recommend you to make a clean install of Windows 7 x64 and tweak it disabling system services that you don't use, installing only programs that you know you will use, tweaking startup with MSConfig and using some type of light files/registry cleaner like the free CCleaner (http://www.ccleaner.com
) after installing and tweaking all what you need to use from now on.
Also, is good to NOT install always the newest versions of every application you use. Just do it if you REALLY need it. For example, I use Nero 7 instead of Nero 9, because it's light-weight and have all the tools that I need (burning CD/DVD, creating movies, ripping music, etc.).
That's the way I install Windows since lots of years ago, for me and my clients were I work.
Hope it helps you. ^_^ PS:
Attached an screenshot from one common installation that I use to do.