I was not sure where t o put this question so if it's in the wrong place I'm sorry.
I have a desktop PC with a 250GB hard disk partitioned into three separate sections.
The first OPs I installed was XP Pro, which I have been running for a long time. Last year I installed Windows 7 on the next partition which automatically picked up the fact I had a previous OPs installed and included it in the boot menu. About three months ago I decided to try out the release candidate for Windows 8, so I installed it onto the third partition, everything went OK and all OPs were in the boot menu and I can boot into all the OPs.
As Windows 8 preview is going to be coming to an end shortly what I want to do is.
I have a version of windows XP home (Retail) I want to install it on the partition where Windows 8 is "Over writing Windows 8" on the third partition and then buy Windows 8 download from the web which will be much cheaper that buying the disc version and then install it as an upgrade over the Windows Home XP.
I understand that to buy the upgrade cheaper version you have to have a OPs of XP SP3 or higher installed so Windows 8 can see that it's legit.
Finally my question is when I install Windows XP Home edition on the third partition over writing Windows 8 when I boot in again will I still be able to boot into Windows 7 and XP Pro or will the MBR be messed up and I can only see the Home, or for the Home and Pro in the boot menu????
If it messes up the boot menu Is there a way to get it back??
Hope you can advise me Many Thanks Tony.

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