Windows gone after update of mac OS
Right-click the untitled volumen in Disk Utility. 
See if it offers "mount".
If it is NTFS formatted (which it appears it is), Mac OS should be able to read it (i.e. copy/recover data from it).

Another option:

Boot from a Windows 7 CD.
Then choose "Repair".
See if it finds any Windows to repair (e.g. offering c:\WINDOWS).
If so, try a startup repair from the given options.
(If it is not showing a Windows that it can try to repair, do nothing).