i used two mirrors for the esf download and i get the same error, someway into the installation it says "Error 1706. No valid source could be found for product ESF beta. The windows installer cannot continue." Right after it says, "Error:-1603- Fatal error during installation. Consult winodws installer (MSI.chm) or MSDN for more information. I had esf 2 months ago on my comp. Could it be that i changed my Counter-Strike directory to CS?