How to upgrade to windows 7 in Thinkpad T400?

I have brought Thinkpad T400 in 2008, I want to run windows 7. I just know I need to upgrade my BIOS to activate windows 7. I will buy a windows 7 from BestBuy, Is it ok?
any one can tell me the steps? Thanks a lot.
My Thinkpad T400 is 2764 CTO,
Intel Core 2 Duo P8400, 2261MHz
ATI Radeon HD3400
BIOS:
Version: 7UET43WW(1.13)
Date: 08/19/2008
SLIC:
Vesion: 2.0
PubKey: LENOVOTP-7U
Marker: LENOVOTP-7U
Solved!
Go to Solution.

Hi,
As usual, it is strongly recommended to backup all important data prior to upgrading any operating system. It is also strongly recommended to verify all currently used hardware and software with the Windows 7 Compatibility Center.
Depending on if you are moving from Microsoft Windows XP or Microsoft Windows Vista there are two different types of installations that can be performed when migrating to Microsoft Windows 7.
First, it is important to note that there is not an in-place upgrade from Microsoft Windows XP to Windows 7. Instead of an upgrade, there is a type of installation known as a “custom” installation. This option for installation is also available when moving from Windows Vista. A custom installation will attempt to back up your data files and bring them over to Windows 7 in what is known as a “windows.old” folder however this is considered to be a clean installation. Your applications that were installed prior to Windows 7 will require reinstallation. You may find the following resource Upgrading from Windows XP to Windows 7 helpful.
If moving from Windows Vista, there is an option for an upgrade installation. The upgrade installation must be initiated from within Windows Vista. You may find the following resource Upgrading from Windows Vista to Windows 7 helpful.
Jessica
Windows Outreach Team – IT Pro

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