Only allowed 2 installs.

Ok heres the thing. I bought the CS4 through my college a few yrars back. I installed it on a computer that took a dive. I didnt uninstall the program before the computer crashed.

I bought another computer and installed it on there too.

What happens if this one crashes? I guess im only allowed 2 installs and thats all. What can i do to install it on another new system if this one crashes too?

[title edited for clarity]