The only benefit of Windows 7 is you can play games on it - but this is changing what with Steam and Wine etc. Trisquel ensures trouble free browsing - with my Windows 7 machine I never allowed it on the Internet (except for once when I needed the GCC compiler for Windows).
You get a lot of programs to choose from in Trisquel for free, that you can download. Things like games, office programs, maths and education stuff. When I was running it I filled my PC with lots of different programming tools, games and VLC (a video player).
Windows 7 also uses loads of RAM (like 3GB or something) whereas Trisquel doesn't. Although this version of Linux doesn't come with propriety graphics cards drivers I think the 3D open source graphic card drivers are getting pretty good now for 3D work/games. Trisquel and Linux distributions in general also don't phone home back to Microsoft, to see whether it's a pirated version or not.
If you do install Trisquel make sure you don't have the Atheros chipset on your wireless/network card. This needs some external proprietary firmware to work. I normally Google the wireless / networking card model and Linux compatibility. Also, if it's a laptop you're using, try to look up the graphics card for Linux compatibility too. I always try the new distro on my hardware and test everything's working before installing it.
