Switching from Ultimate to Professional without reinstalling ?

maybe the iso image i tried is without SP1 but i don't know

Do you have SP1?

Then use the latest SP1 installer available here: Windows 7 SP1 ISO from Digital River « My Digital Life
Windows 7 USB-DVD Download Tool

Please translate the notifications you got to the forum's language.

i can't uninstall sp1 from the current install of windows 7 ultimate because it was installed from the dvd. i've tried to uninstall from programs and features but i have no option to uninstall it.

ok i've just started the download of windows 7 iso with sp1 (in french) from your link.

You do not need to uninstall SP1, only use the latest official Win7 installer with SP1 which I've linked you.

Can you translate the other issues Upgrade Advisor found?

yes, i can translate it:

it says:

The following problems avoid Windows to proceed to the upgrade, complete each task and restart the upgrade to continue.

• Your present version of Windows is more recent than the version you are trying to upgrade.
• Windows can't do the upgrade.
  
  

• Windows must be restarted for the modifications necessary to system files can be done before to follow up.
  
  

[IMG]file:///C:/Users/harlock59/AppData/Roaming/Microsoft/windows/upgrade/images/warning.gif[/IMG] Windows upgrade will affect following devices and/or programs and features :

• those devices might not work correctly after the upgrade. before the upgrade, we recommand you to update those devices drivers. Cancel the upgrade, open control panel and look for « updated devices drivers » or access the manufacturer's website of of the device to search for updated drivers.

• 
  
  • Bluetooth: Android Composite ADB Interface
  • Ports (COM et LPT): USB Modem Driver (COM3)

• Those programs might not work correctly after the upgrade. We recommand you to uninstall those programs before the upgrade. Cancel the upgrade, open control panel and look for « uninstall a program ». (comment : programs having the mark * can be reinstalled safely after the upgrade.)

• 
  
  • iTunes (Please deauthorize computer prior to upgrade)
  • MagicISO Virtual CD/DVD Manager *

i still have the same message with the iso with sp1 from digital river.

i just had to reboot and it worked, i still had the warning message but i had a next button on the right hand corner.

i've uninstalled itunes and magic iso but not the drivers

Is it running the install?

i still have an issue of corrupted files from the iso i burned but i have no md5 for the iso of windows 7 home premium 64bits french