How to delete Windows 10 Boot Managers?

Boot into CLI and use BCDEdit to delete them. https://technet.microsoft.com/en-us/library/Cc709667(v=WS.10).aspx

Hi
I have reinstalled Windows 10 beta twice on my test laptop. But when I install Windows 7 now it will no more boot. I will just see a black screen.
Sometimes I event can’t format the old partitions with the Windows 7 DVD. Then I have to delete all Partitions with a Paragon recovery Linux CD. I think the problem is because the Windows 10 Boot Managers?
If yes how can I get rid of them both?
Any help would be greatly appreciated
This topic first appeared in the Spiceworks Community

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First, a significant increase in raid0 over sata1, sata2 and raid1 with sequential reads and writes (PC Wizard).
Write: 28mb/s vs 29mb/s vs 27mb/s vs 53mb/s
Read: 45mb/s vs 46mb/s vs 43mb/s vs 83mb/s
Second, significant increase in sata 2, raid 1 & raid 0 over sata1 with buffered reads and writes (PC Wizard).
Write: 104mb/s vs 176mb/s vs 165mb/s vs 266mb/s
Read: 123mb/s vs 200mb/s vs 200mb/s vs 293mb/s
Third, significant increase in sata 2, raid 1 & raid 0 over sata1 with burst reads (HD Tach).
Burst Read: 133mb/s vs 225mb/s vs 219mb/s vs 334 mb/s
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