Strange... Are you running any HIPS or whitelisting software, by any chance? Or perhaps it's just a corrupted download? The executable should be 6.3MB. You can also double-check if the SHA1 hash is correct.
Not doing anything of the sort.
Executable is indeed 6.3MB.
You're welcome to take a look with Remote Assistance.
Sorry, i won't be able to help right now due to time constraints...
Hopefully someone else can help you out, or you can try the builds from electrum.org.