i currently have Window 7 home premium and want to try window 7 ultimate or professional. how i can try without removing current installation i have. are this possible to install in this instance i have. currenly my system [lenovo] support 1click boot then i reinstall the windows through one click [lenovo g550]. are that work if i install ultimate. can anyone explain these things: i not want to remove current setting or programms i have installed currently so how i can install windows 7 ultimate then nothing i need to again installed. i have a one click install windows feature are that work after getting windows ultimate means that after getting ultimate how i can come back if i not interested or how i can reinstalled my windows after getting Window ultimate. i not want to install through burning a DVD. are this possible to run ISO and system and they installed them without need of DVD. can anyone can solve these queries i have. a thing common i need to know that how i can get back my current windows [home premium] after installing windows pro or ultimate.

You can use Windows Anytime Upgrade to uprade to another edition: http://windows.microsoft.com/en-US/windows7/help/videos/upgrade-to-another-edition-of-windows-7-by-using-windows-anytime-upgrade Hope this helps.

If you mean can I go back if I upgrade to Pro or Ultimate, the answer is you can use the Lenovo Recovery, but you will lose everything when you do this. And, you will have to pay for the Anytime Upgrades. The Recovery option put in place by Lenovo will restore your system to the state it was when you bought it. The Recovery option completely wipes out the current installation and writes a new Windows system. If you do an Anytime Upgrade to Ultimate, nothing will be removed or destroyed. The Anytime Upgrade "unlocks" features of Windows that are not available in your current Home Premium. The "one click install" will take you back to Home Premium. That's what Lenovo put on the Recovery Partition and an "upgrade" does not do anything to that Recovery data. The Anytime Upgrade does not require a DVD, it just "unlocks" features that are currently not available. The "one click install" or Recovery option will return you system to a clean Home Premium state as it was when you bought the system.Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.