Boot Problem

I have 3 systems loaded on my computer. I started with Win XP and later added Ubuntu. I recently added Win 7 (64 bit ) on a seperate hard drive and had the choice of booting any system.
Now the problem.
Everything worked fine for 2 months and then when I started my computer, I got the message, "Reboot and select proper boot device or insert boot media in select boot device". I loaded the Win 7 disk and did the repair several times. It then stated "The partition table does not have a valid system partition". It also stated that it repaired it but came back with the same error each time I tried to re-boot.
Can anything be done so I don't have to install again and lose all my data?

I'm sorry but I'm not sure what you mean. I can get to the system repair and into dos. Is that what you mean? How do I connect as Administrator? Thanks

I can't get into windows load. It is wanting to know what system to use and I don't have a choice.

Do you know of anything that might have messed up your boot? Did you change anything or add another drive or anything that might have messed up your boot sequence?

Please don't start doing random things to fix this, give us some time to fix iit,

It sounds like something changed that messed up your boot files. Maybe some update changed what was working. Did you change the disk priority in the bios or change the disk connections, or add another drive?

What messed up the boot is likely GRUB.

It needs to be uninstalled before Win7 is installed and then reinstalled to manage the boot.

“How to” Dual boot Ubuntu and Windows 7 (Ubuntu installed first) - Ubuntu Forums

gregrocker said:

What messed up the boot is likely GRUB.

It needs to be uninstalled before Win7 is installed and then reinstalled to manage the boot.

“How to” Dual boot Ubuntu and Windows 7 (Ubuntu installed first) - Ubuntu Forums

I didn't do anything to cause it. It worked the night before and no changes were made. I just checked email.
At least I'm learning Windows 7. Not the way that I wanted to. I have already tried creating a new BCD and it didn't help. I've done the MBR things too. No luck there either. I have decided that it is the Grub that was doing the boot and somehow it quit working. I amy in the process of formating another drive and I am going to put another install of Win 7 on it and then move my files off of the other drive unless I can get to it and fix it from windows.
Any suggestions?
Thanks

Make sure the partition containing the windows boot critical files is marked active.

Use a bootable partition manager , or the command prompt with Diskpart.