If you loose (it's hidden) your System Partition (the one with the boot files) after installing Windows 7 on a dual boot machine, you can show it again by assigning it a Drive Letter in Windows 7's Disk Manager.
You may also have other access problems when it comes to running .exe, .bat or similar files from the now unhidden partition. This can be fixed by copying the .exe etc to another location on another partition such as something like your folders on the Windows 7 partition.
You may also have other access problems when it comes to running .exe, .bat or similar files from the now unhidden partition. This can be fixed by copying the .exe etc to another location on another partition such as something like your folders on the Windows 7 partition.