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Reinstalling Window 10 (free Upgrade)

Prasadh Baapaat
Last Modified: 2016-08-18
Hello ,
I had windows 8.1 and had opted for the free upgrade... I liked using Win 10... but some days back I was trying out installing some new software and I guess it was infected.. I abandoned it halfway ... but it had installed some adware already.

I removed the adware but now I am observing the machine has become slow... it takes 5 mins to shutdown... so I guess something is wrong.

I want to reinstall the OS, but now will my win 8.1 be upgraded to Win 10 OR it will be 8.1 when I reinstall it.

I like win 10 and don't want to lose it OR pay for buying a new win 10.

any help appreciated.
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