Illegal operation

While using my Windows 98 computer, a message came up telling me that the application will close because it has performed an illegal operation. I clicked on detailes and this is what it said…

“YBROWSER caused an invalid page fault in
module MSHTML.DLL at 0167:70dc70aa.
Registers:
EAX=000000ce CS=0167 EIP=70dc70aa EFLGS=00010202
EBX=00000000 SS=016f ESP=0068ed4c EBP=0068ed50
ECX=00486344 DS=016f ESI=0068efec FS=1957
EDX=00000000 ES=016f EDI=00486344 GS=0000
Bytes at CS:EIP:
8b 08 ff75 14 ff 75 10 ff 75 0c ff 75 08 50 ff
Stack dump:
0068efec 0068ed78 70c77860 00000b78 0000df8f 0068f1d8 00000000 0068efec 00486344 0000df8f 0068efec 0068eda8 70c8da19 0000df8f 0068f1d8 00000000 ”

Does anyone know what this means? What causes this error message and how can I solve it so that it does not occure again?