Q2 OS & PC Requirements?

Howdy again,

I read through the archives, but did not see an answer.

What are the computer resource requirements for the Quartus II versions .GT. 7.2? OS version. How much memory? Processor type, speed, yada yada?

Is it required that I uninstall previous version Q2 to install later version? If I install on top of previous version will doing so break anything?

Thx in advance,

altera_student