Does your PC know who you are--really? Make sure that Windows has your name and company information correct, because many Microsoft applications automatically pick up this info when you install them.
In the Registry, find the key called HKEY_CURRENT_USER\Software\Microsoft\MS Setup (ACME)\User Info in the values DefName and DefCompany. Change these to reflect the correct information.
While you're at it, make sure that your name and company name appear correct in the rest of Windows. If you bought your PC with Windows preinstalled, the value may say something like ValuedCustomer. To check, start Windows Explorer, click on Help, About Windows. Navigate to the Registry key HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion and change the values called RegisteredOwner and RegisteredOrganization. (In NT, look at the key \Microsoft\Windows NT\ CurrentVersion.)