Illegal Operation window

I believe I entered the below in the Internest/Outlook thread by mistake ...

All of a sudden, when I am on line using Yahoo engine, I find a site, and try to enter one of its pages, I get the "illegal" window and lose the Internet connection altogether.

Details are:

EXPLORER caused an invalid page fault in
module MSVCRT.DLL at 0167:78015ca2.
Registers:
EAX=0000f3a0 CS=0167 EIP=78015ca2 EFLGS=00010246
EBX=00000010 SS=016f ESP=01c6c1f8 EBP=01c6c208
ECX=7803a13e DS=016f ESI=70a7f3a0 FS=5a77
EDX=0000000f ES=016f EDI=01c6c242 GS=0000
Bytes at CS:EIP:
66 8b 0c 41 f6 c1 04 74 6b 8d 48 d0 3b cb 0f 83
Stack dump:
01c6c2ac 70a741cc 00000000 00000000 01c6c264 78015c08 01c6c240 00000000 0fffffff 00000000 637a24ad 01c6c240 00000000 00000010 00000001 635e7e2c

I reinstalled Windows 98SE and ran virus check.

How do I solve this problem?