When I start up my machine, I get window that pops up and says, "The instruction at '0x77c4805f' referenced memory at '0x77629304'. The required data was not placed into memory because of an I/O error status of '0xc0000185'." It causes my machine to take a long time to start up and it hangs often. Do you have any idea what this means? I am using XPHome 2002 with SP2 running on an HP with a P4 processor and 512 MB RAM..... What can I do to fix this problem?