markf1 on "Xampp/Apache not working"

I have Xampp installed on a dedicated drive. nothing else is installed on the drive. I have 6 different WordPress sites on my localhost. I have had all of these sites set up for several years and they all worked fine until today.

Now, for some unknown reason, 2 of the sites return an error message that Apache Server has stopped working. But it hasn't stopped working. The two sites that have the problem have 5 pages that are just HTML/CSS pages and are not php/WordPress pages. WordPress is used for the blog component of the sites and not for the rest of the site pages.

All the other sites work just fine. some of the other sites are the same type of primarily HTML/CSS pages with a WP blog, two of the other sites are full/all WP sites. all these WP localhost sites continue to work perfectly while at the same time the 2 sites deliver the "Apache HTTP Server has stopped working " error.

Can anyohe help me with this? I have no idea why this suddenly started on just two site only an dhow to go about trouble shooting and fixing.

Detail error message is below

Problem signature:
Problem Event Name: APPCRASH
Application Name: httpd.exe
Application Version: 2.4.3.0
Application Timestamp: 502f70a3
Fault Module Name: php5ts.dll
Fault Module Version: 5.4.7.0
Fault Module Timestamp: 505114f8
Exception Code: c00000fd
Exception Offset: 00039fa3
OS Version: 6.1.7601.2.1.0.256.48
Locale ID: 1033
Additional Information 1: 6017
Additional Information 2: 601762da363e8e683a9c7bfdb56acaf7
Additional Information 3: 35e5
Additional Information 4: 35e54b1d73852dc83ee624c1cfaccd9c