windows 7 activation help needed asap

[garethwalker]

so i bought a latop over a yr ago with pre installed windows 7 home premium on then a few months ago upgraded to windows 7 ulitimate which i bought online i now know to be a illegal copy of windows 7 premium now i keep having windows activation required on start up screen it say this copy of windows is not genuine does anyone no how i can re install the original copy of windows that was installed before i messed it all up i have tried all system restore and system image option to no joy the laptop does have the windows 7 product key sticker on back of my sony vaio but have no disk and not that skilled on computers to know what to do all help will be gratefully recieved

 

[whs]

Here you find everything you need.

http://www.sevenforums.com/tutorials/219487-clean-reinstall-factory-oem-windows-7-a.html

Just make sure you save all your data before the reinstall.

 

[NoelDP]

Before doing anything rash...

To properly analyse and solve problems with Activation and Validation, we need to see a full copy of the report produced by the MGADiag tool
(download and save to desktop - http://go.microsoft.com/fwlink/?linkid=52012 )
Once saved, run the tool.
Click on the Continue button, which will produce the report.
To copy the report to your response, click on the Copy button in the tool (ignore any error messages at this point), and then paste (using either r-click/Paste, or Ctrl+V ) into your response.
- in your own thread, please

Please also state the Version and Edition of Windows quoted on your COA sticker (if you have one) on the case of your machine (or inside the battery compartment), but do NOT quote the Key on the sticker!
http://www.microsoft.com/en-us/howtotell/Hardware.aspx