A cheap way around this (not efficient) is to simply add a useless file with notepad or some other basic program called System32.exe in the specified folder.
This error occurs when a few viruses which have attatched themselves to your startup in a hidden manor are trying to load and the infections have been removed.
A more proper removal can be done in the registry, under the path:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Curr entVersion\Run registry subkey
or something similar (this is what was the path on my roomates comp)
and delete any key named: Explorer.exe C:\Windows\system32\system32.exe or cmd.exe or cmd32.exe
this should remove the call to launch this file.