Doctor Watson – DRWTSN32.EXE
Drwtsn32.exe is Microsoft's Dr. Watson utility. Microsoft describes this tool as follows: "Dr. Watson for Windows is a program error debugger that gathers information about your computer when an error (or user-mode fault) occurs with a program. Technical support groups can use the information that Dr. Watson obtains and logs to diagnose a program error. When an error is detected, Dr. Watson creates a text file (Drwtsn32.log) that can be delivered to support personnel by the method they prefer. You also have the option of creating a crash dump file, which is a binary file that a programmer can load into a debugger."
You'll find more information at http://support.microsoft.com/default.aspx?scid=kb;EN-US;308538.
Often when you see this file running, there's an error or problem with a program. In general, we'd recommend against removing this file.
Safe
Microsoft