"This copy of Windows is not genuine" - Why am I getting this - Microsoft Answers
Answer The Microsoft Activation Hotline - (888) 571-2048
You may be prompted to activate Windows Vista on a computer on which Windows Vista was already activated by a Volume License or OEM installation (this means like your Dell)http://support.microsoft.com/default.aspx?scid=kb;EN-US;931573
SYMPTOMS - You may be prompted to activate Windows Vista on a computer on which Windows Vista activation was not previously required. For example, this problem may occur on a computer where Windows Vista was preinstalled by an OEM or by using a Volume Licensing installation. The problem does not occur on Retail versions of Windows Vista. For example, the problem does not occur if you purchased Windows Vista and installed the operating system on a computer yourself.
CAUSE - This problem may occur because a specific system setting is removed when a program runs with administrative credentials. The removal of this system setting may cause a BIOS validation check to fail. The BIOS validation check is part of the system activation process. Therefore, you may be prompted to activate Windows Vista, even though the system did not previously require activation. For example, this problem is known to occur when you use Intuit QuickBooks 2007. However, this problem may also infrequently occur when you install other programs or device drivers.
RESOLUTION - To resolve this problem if it has already occurred, use one of the following methods:
• If you have been prompted to activate Windows Vista, and you have not used the product key to manually activate Windows Vista, install update 931573, and then restart the computer.
• If you have been prompted to activate Windows Vista, and you have used the product key to manually activate Windows Vista, install update 931573, and then activate Windows Vista by telephone.
Note If Windows Vista was preinstalled by an OEM, the product key appears on a sticker on the case of the computer. MS-MVP - Elephant Boy Computers - Don't Panic!
Jan. 2, 2010