Phantom Trojan

I tried to install a program from the last APC magazine disk (May).  The install failed but ever since I get notification of a trojan which cannot be removed and is allegedly on the D: drive.  The D drive is my cd drive, full scans fail to find any problem on the C drive.  The message popping up is very annoying, does anyone have any ideas on how to fix this?  I carried out all of the actions for removal without success, and I have searched the registry but the string is not there.  Help!