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Installing a custom W7 install disc over a existing W7 install

Joined
Oct 4, 2013
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I have a stock W7 x64 installed on a GPT drive, no tweaks or updates.
I have a custom W7 boot disc with updates and a number of tweaks I want to install over and replacing this existing O/S to make things easier since many of the changes will save a lot of time and hassle.

This custom W7 x64 (AFAIK) disc (RT7 Lite) wouldn't install to this disc with the GPT error message, so I tried a 'stock' W7 which worked to my surprise.

Will installing W7 over W7 wipe the existing data in the 3 O/S partitions?

Side note the drive itself was already partitioned with the 2nd partition being used for storage. There was no issue here, the original finished install didn't bother this data partition. I hope all of that makes some sense.
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