Multiple versions of Windows could co-exist on same computer,
but sometimes (often?) this gets complicated.
When computer is able to boot, a tool to manage OSs is "bcdedit"
(Vista, 7 and newer Windows verions)
Dual Boot - Change OS Name in Windows Boot Manager - Windows 7 Forums:
bcdedit / ?
bcdedit / enum
"bcdedit /set {current} Description "Windows 7 (build 7000)""
When the computer is not able to boot, from install DVD there is a "recovery" option,
and from command prompt call
bootrec /?
bootrec /fixboot
bootrec /fixmbr
bootrec /ScanOS
bootrec /RebuildBCD
This could be a risky business, so always backup first.
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