This is from the Microsoft site
(
http://support.microsoft.com/kb/931276/en-us)
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Error codes 0xC004F027, 0xC003E004, and 0xC004E003
If you receive one of these error codes, reactivate Windows Vista. To do
this, follow these steps:1. Open the System item in Control Panel. To do
this, click Start, type System in the Start Search box, and then click
System in the Programs list.
2. In the Windows activation section, click the Change product key link. If
you are prompted for an administrator password or for confirmation, type the
password.
3. In the Product key field, type the product key, and then click Next.
4. Follow the steps in the Windows Activation Wizard to complete the
activation process.