DAP.EXE – APPLICATION ERROR

SOMETIMES WHEN I DOWNLOAD OR OPEN A FILE FROM INTERNEI I RECEIVE ERROR LIKE.
The instruction at “0x004:802c” referenced memory at “0x00000004”, The memory could not be “written”.
Click on OK to terminate the program.
Click on cancel to debug the program.
If i cancel icannot open same goes to if i click OK.
At times i receive instruction at “0xe0883a68” refenced memory at “0x0883a68”,The memory could not be written.
instruction at “0x77d366c6” refenced memory at “0xa4c2cdf4”,The memory could not be written.
I hope somebody can help me in this.
Thanks