How do I read a 3 Terabytes windows usb external hard drive on my new Linux system without reformating?
Just mount it as you would any drive.
You can't upgrade from Windows XP to Windows 7 directly without using external tools or software- you must do a clean install. What you can do is use tools like Zinstall XP7 to move all programs and files, or Windows Easy Transfer to move only the files and settings- from Windows XP to Windows 7. These tools makes the migration much easier then simply re-installing everything and copying it to Windows 7 from scratch.
Can I reinstall Windows XP without loosing my info if I don't have the repair option after the license agreement?
Microsoft have a tool you may run to check hardware compability. In most cases Windows 7 machines may run Windows 10. For the limited free upgrade you will need the Windows 7 activation key. If not advanced user the most practical way would be reinstall Windows 7 and activating that first. You can then download and run the upgrading software from Microsoft websites directly onto your machine without a external media.
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The Windows Server 2008 platforms are as follows: Windows Server 2008 Standard Edition Windows Server 2008 Enterprise Edition Windows Web Server 2008 Windows Server 2008 Datacenter Edition Windows Server 2008 for Itanium-Based Systems Windows Server 2008 Standard Edition without Hyper-V Windows Server 2008 Enterprise Edition without Hyper-V Windows Server 2008 Datacenter Edition without Hyper-V