orginaly the duck
when you say "my machine" are you talking about looking for exploits in your source code for a website or something?
i agree with the duck here are you a coder and want to know how to check your home made software or do you relay mean checking all the software on your machine for buffer overflow exploits if so good luck i mean even if you had the source code for it it would take eons. From a programmers point of view every time you accept user input you need to check to see if they stay inside the limit of whatever your temporary storing their request in. Other wise you have a buffer overflow exploit.

ok i am oversimplifying but still..

if you clarify your question a bit maybe we can give you some more input.