Memory referenced error

Hi, when ever I close my IExplorer Browser, running NT Serevr 4.0 (Sp6a)I get this:
“IExploere.exe Application Error”
This instruction at “0x77f88aa87” referenced memory at “0x00000018”. The memory could not be “read”. cLick OK to terminate theapplication.

Also when I start my Server, a window opens & displays all files of “C:\WinNT\System32”. where in registry do I check for this.
Akash