Two operating systems Windows 7 & XP Pro

[FlowerPower]

I have 2 operating systems W7 and XP Pro. On start up a black screen would appear and I would have a choice of which system I wanted to operate in. If I did not choose it Windows 7would open automatically, which is fine (this one is the main one I operate from and the only one which has been setup for the internet). Q: I have had the PC off, turned it back on and the page that I had a choice from has now disappeared, XP Pro opens automatically now. Where do i find Windows ?  Help 

[Transfusion]

http://www.boyans.net/
This may help.

Visual BCD Editor is an advanced GUI version of Windows bcdedit utility. It is the first GUI tool to implement full editing of Windows 7/Vista Boot Configuration Data (BCD) store. Dual-boot Repair tool - automatic one-click repair for dual or multi boot systems based on Windows 7/Vista.
Accompanying Dual-boot Repair tool is part of Visual BCD package and needs .NET Framework 2.0 and Windows XP as minimum.

It can repair the MBR, partition boot records (PBR's), Windows BCD store and the disk structure by simple selections and clicks. The tool offers automatic one-click dual-boot repair for non-booting Windows 7/Vista in the scenario of a dual or multi boot system with Windows 7/Vista/XP (and other non-Windows operating systems).

The program works under WinXP, so that's good.