Hello, here is a few things you can try
Method 1: Re-insert the product key by using the "Change product key" tool
To re-insert the product key, follow these steps:
1.
Click Start, click Computer, and then click System properties on the toolbar.
2.
In the Windows activation section, click Change product key.
If you are prompted for an administrator password or confirmation, type your password, or click Continue.
3.
In the Product key box, type the product key, and then click Next.
4.
Follow the steps in the Windows Activation Wizard to complete the activation process.
If these steps do not resolve this issue, continue to Method 2.
Method 2: Restore your computer to an earlier date and retry the Activation process
To restore the operating system to an earlier time, follow these steps:
1.
Click Start, type system restore in the Start Search box, and then click System Restore in the Programs list.
If you are prompted for an administrator password or confirmation, type your password, or click Continue.
2.
In the System Restore dialog box, click Next.
3.
In the list of restore points, click a restore point that was created at least oneweek before the current date, and then click Next.
Note If you do not find a restore point that is at least one week old, select the earliest restore point that is available.
4.
Click Finish.
The computer restarts. The system files and settings are returned to the state that they were in when the restore point was created.
Note If you have no previous restore points, or if restoring to a previous restore point does not resolve the issue, continue to Method 3.
Method 3: Activate Windows Vista by using the automated telephone system
To activate Windows Vista by telephone, you must use an automated telephone system.
To activate Windows Vista by using the automated telephone system, follow these steps:
1.
Click Start, and then click Computer .
2.
Click System properties on the toolbar, and then Click here to activate Windows now in the Windows activation section.
If you are prompted for an administrator password or for a confirmation, type the password, or click Continue.
3.
Click Show me other ways to Activate.
4.
Click Use the automated phone system, and then follow the instructions.
............................................................................................Main System Spec: Intel Quad Q9550 (OC to 3.4Ghz), Gigabyte Ga-ep45-ud3l, 4gb kingston hyperX @ 1066mhz, Corsair tx 650, Nvidia 8600GT.
