I am still stuck with my localhost moodle sites. I have completely re-installed my Windows 7 (64bits), XAMPP, etc. but to no avail. I confirm that whenever I get the "incomplete page" symptom, it looks like Moodle (php ?) is stopping sending HTML code to the page.
In fact, the problem appears immediately upon installing a fresh version of Moodle, so none of the moodle site settings that have been suggested in this discussion apply.
Further to Guillermo's suggestion I have looked at the Windows Event observer and I get this Application error message:
Faulting application name: httpd.exe, version : 2.4.10.0
Faulting module name : php5ts.dll, version : 5.5.15.0
I have found many references to this problem on the Web, but none of the "solutions" provided works for me.
Joseph