Can't format partition with Vista on it from dual boot

Hi Byronic, OS's are pretty protective of each other. Try a third party partition tool. Easeus has a free version of their Partition Manager. It works great and doesn't care what is on that partition. I've used it several times myself.
Hope this helps. Have fun!

Still wont let me format it. Doesn't even give me the option. I'll give you some more specs on it. I have a 750gb hd with 2 partitions on it C: drive and F: drive. The C: is my current os Windows 7 while the F: is my old Windows Vista. When I bring up easus partition manager the status's of the drive's are C: as Boot and F: as system. Even though I don't use F at all. Im thinking it has something to do with the MBR. Not sure though.

Alright so now I have huge problems. I made the windows 7 partition the active partition and restarted. Once I did that It constantly kept coming up with BOOTMGR missing. Problem is I had Windows 7 in a ISO on that partition and not on a disc. So I decided to install vista again on the partition that already had vista on it so I could at least run something.

So as of now I'm running vista with 7 on a different partition that doesn't boot. When I try to boot 7 It says Windows cannot verify digital signature. Really my main problem is after I did all this and booted vista one of my hd's with all my music on it is not letting me access it. When I double click it, it just says would you like to format. This is really freaking me out because I had over 360Gbs of music on there. I'm not sure if it has to do with me only being able to access it in Windows 7 or what. Any help would be greatly appreciated because I am freaking out.

What do you mean "Problem is I had Windows 7 in a ISO on that partition and not on a disc" - did you have a working Win7 installation which you marked active but failed to recover the MBR into by running Startup Repair from the Win7 DVD three times?

Please post back a screenshot of your full Vista Disk management drive map so we can advise you of the exact steps to remove Vista and the dual boot.

Use Snipping Tool in Start menu, attach file using paper clip in reply box.

We have helped remove over 150 dual boots successfully since Win7 release but need to see the config to advise the exact steps. You will need free bootable Partition Wizard burned to CD to carry out the steps.

Well, now you know why it would not let you delete the partition. The boot files (bootmgr) were probably on the Vista partition.

Don't worry, it can be fixed, but please attach a disk management picture as asked.

Alright guys, So I managed to get my C: running again by installing another copy of 7 onto the F: drive. I'm guessing it needed the boot file on the other hd. Now my main problem is that my Music is missing on one of my hd's. Not sure wtf happened but it's all gone now and when I double click onto the hd it just gives me the option to format. Here's a screenshot of my disk management. The E: drive is the one that is supposed to have my music on it. It is supposed to be a 500GB hd but it's only showing as 128 RAW. I had over 380Gb's of music on it.

Also, I Would like to format F: for space but I'm afraid once I do that C: wont work again.

[IMG]file:///C:/Users/BRon/AppData/Local/Temp/moz-screenshot.png[/IMG]

The problem is that your D:Video drive has derailed the System MBR. This can happen when a data drive becomes marked active as the installer looks for first available active partition to place the MBR.

Use free Partition Wizard bootable CD to mark D: and E: inactive. Then delete F:

Make sure Win7 is set first HD to boot into BIOS setup, after DVD drive.

Now boot Win7 DVD, select Repair my Computer on second screen, click through to Recovery Tools list to run Startup Repair up to 3 separate times with reboot to write the system MBR into Win7 partition.

If the incorrectly marked System active Video partition continues to interfere to block the recovery of System MBR to Win7 partition, unplug it until after MBR is written to C: by running Startup Repair 3 times.