There are two places at least where ProductId gets stored. To see the first place, open Registry by going to START-RUN and entering REGEDIT and Navigate to [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WindowsNT\CurrentVersion]

In right pane, look for key by the name "ProductId". This is your Windows Product Id. Alternatively you can navigate to [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion]

and still find same field with the name ProductId.

PC-Maintenance

Maintaining your computer to keep it working healthy.

Increase Your RAM and so system speed

Free up your computer RAM to increase speed.

Increase Bittorent Download Speed

Tweak to increase bittorent p2p download speed.

Top Ten Tips To Improve System Speed

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Top 20 Tips To Keep Your System Faster

Top 20 Computer tips to make your machine fast.