Ok, this is an old thread but I happened to find my way here with a quick google search. My problem was a malfunctioning mouse which would give me two click is rapid succession with single click. Just needed a dirty fix until I get my new mouse. Didn't find my answer after few tries, so I decided to brute my way in to solution (Process Monitor, great tool).
The registry entry you should look for is,
"DoubleClickSpeed" in HKEY_CURRENT_USER\Control Panel\Mouse
The default Control Panel values range from 900 (slow) to 200 (fast). So a small number should work, I found 50 be impossible for me to get a double click to happen. You can go as low as 1, but a 0 will not work good, seems revert to some slow value in practice.