Hello Ika,
Prior to migrating to Windows 7 from Windows XP did you run the Windows 7 Upgrade Advisor?
To determine if your current computer configuration will be compatible with Windows 7 please go to the following link:
http://tinyurl.com/no4xb7
Another resource to verify compatibility is available at the Microsoft Windows 7 Compatibility Center located at the following link:
http://bit.ly/1gW6Ns
You can visit the official Microsoft Migrating from Windows XP to Windows 7 site here:
http://tinyurl.com/yz2uogt
There are some nice videos tutorials and steps to take when migrating from Windows XP to Windows 7. And yes it is true you cannot directly upgrade from Windows XP to Windows 7 you can take some steps to ensure a smooth process.
Thanks again and good luck!
John M.
Microsoft Windows Client Support