Dear Everyone, I've purchased Toshiba Satellite P755 laptop which has Windows 7 64 bit Home Premium. I am planning to upgrade it to Windows7 64 bit professional. I'm planning to purchase 'Microsoft Windows 7 Anytime Upgrade [Home Premium to Professional]'. Kindly clarify below doubts: a) I've already installed some s/w on my machine. If I upgrade it to 'Professional'; is it going to make any changes/deletes to the existing software? b) Does it going to wipe out all the data and s/w's I configured so far? C) The 'Microsoft Windows 7 Anytime Upgrade [Home Premium to Professional]' CD which I am planning to purchase is sufficient enough to upgrade to Windows 7 64 bit professional from Windows 7 64 bit Home Premium? Kindly clarify my doubts ! Thanks in advance !! Regards, Satya

a) It will not make any changes to your existing software. b) It will not wipe out your data but I would backup anything you cannot afford to lose just in case. c) Purchasing the Microsoft Windows 7 Anytime Upgrade [Home Premium to Professional] key will allow you to upgrade from Windows 7 x64 Home Premium to Windows 7 x64 Prodessional. See this: http://windows.microsoft.com/en-US/windows/shop/windows-anytime-upgrade