Just wanted to give you a heads up:
whosthere.exe and iam.exe seem to not be working with all the latest patches for xp sp3 applied. Can't really say which patch caused the problem and it doesn't matter that much anyways.
The problem is apparently that the tools just can't find the memory addresses they need, based on which I assume fixing the issue is simply a matter of modifying the heuristics used to find these addresses. I'm already looking at this issue and will release a new version soon.
Meanwhile, the '-alt' versions of the tools (whosthere-alt.exe and iam-alt.exe) still work; so, if you encounter yourself with this problem, just use the -alt versions.
As always, feel free to email me if you have any other questions/problems.