What is causing a netscape page fault?

I have a system with a 200mhz processor, 48mb memory, and WIN98 as well as Netscape 4.72.
Each time I start Netscape, it generates a
“Hidden Frame” page fault. This start happening when I installed 4.72 and is now starting to happen to one other program. Does anyone have any idea what would be causing this problem and just what is this Hidden Frame that is referenced in every abend.???