Hello friends i think this is the common problem to all, as if you use Windows 7 as a second operating system with Windows Vista or Windows XP boot menu option automatically creates a new operating system option in the boot menu there. However, if you have Windows 7, and then try installing Windows XP, you will overwrite the MBR with one that does not recognize the code, the boot loader of Windows 7.
If any body of us are in the same situation and looking for the way to fix and get back Windows 7 option in boot menu then follow below simple steps.
Open a command prompt in the Xp/Vista operating( i mean in the older operating systems ) systems and run from the Windows 7 DVD the following command, Hear H is my drive letter replace yours:
H:\boot\ bootsect.exe /nt60 all
Just restart, now you should see the Windows 7 menu.
To restore the menu entry for your earlier version of Windows, open an elevated Command Prompt window and type this command:
bcdedit /create {ntldr} –H “Menu description goes here”
Cheers:
Substitute your own description for the placeholder text, being sure to include the quotation marks. The next time you start your computer, the menus should appear as you intended.
Source: Technet
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Some times your USB drive or pen drive my face this serious problem, although the drive seems normal and is being detected by the OS, yet it shows the drive is write protected when you try to put some data on it. I think now a days this is very common problem when using USB flash drives. Sometimes when you try to copy or delete files you get an error message “Remove the write-protection or use another disk”. It won’t allow you to format!

























