Note: Always use the slowest burn speed (4x or 2x) if offered a choice.
If your original copy of Windows 7 was an OEM copy that came preloaded with your machine, you can reainstall and reactivate it using the following methods:
Boot from the Windows 7 DVD
Click Install Now
Accept License Agreement
When the option is displayed to select an installation type, click (Custom Advanced)
Click Drive Options
Select the drive/s click Delete
Click Format and click Next to proceed with the installation
Skip entering your Windows 7 product key and complete the installation.
Click Start, right click Computer
Scroll down to Windows activation.
You will notice it displays a time until Activation but be completed. Also the Product ID indicates it is using a default key, this is only for the 30 day grace period allowed until you must activate Windows 7.
Click the link, Change product key
Enter the product key located on the COA sticker located at the bottom or (sometimes in the battery compartment of your laptop), you can also find it at the top or side if its a Desktop computer. It looks something like the following:
Proceed to enter the product key and click Next
Wait while Windows attempts to activate.
If all goes well, within a minute, you should see this screen.
You can further confirm Windows 7 is activated by checking the Windows Activation status:
Notice Windows 7 now displays OEM within the Product ID to indicate the product channel it is licensed from. Please note, this also works with Windows Vista if you are still running that version.
If you are unable to activate Windows 7 using the Change product key method, you can try phone activation and speak with a call agent who will assist with reactivating Windows 7:
How to activate Windows 7 manually (activate by phone)
1) Click Start, and in the Search box type: slui.exe 4
2) Next press the ‘ENTER’ key
3) Select your ‘Country’ from the list.
4) Choose the ‘Phone Activation’ option.
5) Stay on the phone (do not select/press any options) and wait for a person to help you with activation.
6) Explain your problem clearly to the support person.