I read some of these answers people give and they know not what they say, The simple answer is most windows games can be played on Linux now, and Most Games manufactures are porting their games over to Linux,
Most windows users think Linux is a 1% operating system when in fact it's not There are more people using Linux than meets the eye. There are more hardware companies supporting and developing Linux than meets the eye. Here is the proof of what I'm talking about
Members of the Linux Foundation
http://www.linuxfoundation.org/about/members
50 places that run Linux,
http://www.focus.com/fyi/50-places-linux-running-you-might-not-expect/
Out of the worlds top 500 fastest computers, Linux runs 490 of them Unix runs on 8 of them, MS runs on 2 of them
http://www.top500.org/
There are more people using Android phones than there are mac iPhones
What operating system is Android? = LINUX so is Linux a 1% operating system.
I forgot to mention can you run windows 7 on old computers with 512 megabytes of ram in? "NO"
Can you run Linux latest July 2012 operating systems kernel on old computers with 512 megabytes of ram in "Yes" "Yes" "Yes"