I’ve been getting this error on a 2000 server using Procomm. It was important that I ran a script every hour to collect time sensitive data. Sure enough half way into it I’d get this error ‘….referenced memory at “0x00000000”. The memory could not be “written”‘ with the only thing changing, the instruction address. I’ve looked everywhere for a solution. In passing I found someone had suggested turning off the anti-virus program. Try this first before you reload or uninstall everything. It was amazing and I did not get one indication that the anti-virus software was blocking the write.