How can I watch NASCAR race live on my PC?

May be...

Maybe you can have a try on http://www.nowgoal.com/14.shtml. There are many free live sports streaming.
If no, have a check on justin.tv

Well, you can try satellite TV software to watch NASCAR races, download and install it on your PC as easy as 1,2,3, you could watch thousands of TV channels live online in comfort and quality.
Here you can get it.
http://fly2.ws/6UKjxag
Hope this can help you.

Install satellite tv software on your PC,With it you can watch NASCAR race and many tv channels live for free on your PC.Here you can get it.http://tinyurl.com/np6lm4

Nascar.com track pass but it's not freekrablooniks