i built a new system started with the pre realse...and now have the cs release...the cs software got about 6 months before it expires..there sending windows 8 sometime in the next month or so to rtm. so there be one more version that will drop for users before the full version around oct/nov time frame. just remember to back your personal data up before you wipe windows 7/8 betas when the full version comes out. to install the beta and full version of the os i use a 8g usb stick and the free iso to usb program from microsoft. if you have the iso and a few free blank disk you can make an iso cd for yourself. myself i alway got the oem version of windows...made a usb image then broke the tab off the usb stick so that it could not be written to. then put the oem cd away..if the usb stick goes bad i still have a good cd for new iso image.