IBGerm

Yes, you can.

Yesterday, I installed Windows 7 Pro on my 5 year old Dell M70 laptop. It currently had only Windows Xp pro. I at first had to change and create a partition on my hard drive to install Windows 7 I gave it at least 20 gigs of free space. I used a Live Linux  Cd called GParted ( I will link to that later). So now, I set up  XP/ Windows 7 dualboot. The Windows 7 installer set the  default boot choice to  Windows 7 and renamed the XP as “Previous version of Windows”, also a timeout of 30sec set.

If you try to modify the boot options the old-fashioned with boot.ini file, you get the following warnings:

    !!Warning: Boot.ini is use d on Windows XP and earlier operating systems!! 
    !!Warning: Use BCDEDIT.exe to modify Windows Vista boot options!!

If you examine, Windows 7 doesn’t have NTFS write permissions on XP system partition, even though it creates a "boot sector" inside it, cause it is the first one in line on the system disk, which is shared half on half by both systems.

So I booted into Windows 7, and run the following commands: 

• By default Vista/Windows 7 open command prompt in user mode, so we need to change the permission. To do so, just execute this command:
  Start Menu > All Programs > Accessories > (right-click & "Run as administrator") Command prompt
• bcdedit /set {legacy} Description "Windows XP Pro" (Changes the text description of the "Legacy" OS line in the boot menu. he quotation marks must be included in the command)
• bcdedit /default {legacy} ( Sets the legacy (Windows XP) OS as {default} boot item)
• Running bcdedit /? (shows all commands one is able to use)

Also, if you go into the system properties (right click my computer,properties, Advanced System Settings, Click the advanced tab, under start up and Recovery, setting,) You can change the Default as well as the time to display it.