Access Violation and Invalid Page Fault

I have a PC with Celeron 700mhz, 128Mb memory and 10Gb disk space (50% free). I am running Windows 98 and IE6.
Too frequently I am receiving these two error messages intercepted by Dr Watson:
“Access violation at 702234f4 in module WININET.DLL” and “RUNDLL32 caused a page fault in module WININET.DLL”
What can I do to solve these problems?
Thankfully,

Icaro.