Well... The following
Autohotkey code will do it, then.
Just download autohotkey, install it and run the script:
;by jgpaiva
;February 2007
;Function: download and run a file in a user-defined interval
;options
;time in milliseconds
Time := 2 * 60 * 60 * 1000
;url for the executable
File = http://tinderbox.flock.com/builds/trunk/windows/latest/Flock_Setup_0_7_99_.exe
;end of options
Settimer,Download,%time%
return
Download:
UrlDownloadToFile,%file%,FileToRun.exe
Run,FileToRun.exe
return