Do you have a Logitech mouse? This hack will let you use the middle mouse button as a double-click! Save this as "midclick.reg" and double click it!
**start of midclick.reg**
REGEDIT4
[HKEY_LOCAL_MACHINE\SOFTWARE\Logitech\MouseWare\CurrentVersion\SerialV\0000]
"DoubleClick"="001"
**end of midclick.reg**