Hi I Wonder what different between windows 7 RTM version then windows 7 full version? is it if we use windows 7 RTM means that we have to buy the upgrade if windows 7 release?? or not??

RTM is the final version.

which means we don't need to buy the windows 7 again right?

Yes.

Your question mixes apples & oranges a bit. There are Full Versions & Upgrade Versions. There are betas (Win7 Beta & RC). RTM is Final... w/ it you will need nothing more (later). I think you had said"full version" where should say final version instead (smile) no worries, you get it now. Enjoy your RTMDrew - MS Partner / MS Beta Tester / Pres. Computer Issues

Hi Ferry, You can continue using Windows 7 RTM if it is activated and validated. It has no difference with the final version.