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how can i recover my original pre installed windows OS ??

 Hello,

 

I have purchased ACER-5742 model in 2011.It has Windows 7 Home basic 64 bit operating system pre installed. But unfortunately my brother installed pirated version of OS- windows 7- premium on my laptop. I have my Home basic product key. I tried to install origial Home basic from Windows 7 Website. after product key verification it showed me followig message,

Error

The product key you entered appears to be for software pre-installed by the device manufacturer. Please contact the device manufacturer for software recovery options.

Kindly help me out, what should i do to to recover my original OS.

 

Thanks in advance.

swapnil

 

[edited for privacy-please do not post personal or unique information such as but not limited to full names, email addresses, phone numbers, full serial numbers, etc.]

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