Adobe Flash Player Installer Disappeared

Hello,

OS: Windows 7 Home Premium (32 bit)
Browser: Firefox 3.6.12 (32 bit)
Flash Player: Adobe Flash Player 10.1 (2010-11-23)

I have downloaded and installed the adobe flash player from the following url http://get2.adobe.com/flashplayer/ (filename: flash+mss_d.exe around 8xx kb). Everything seems fine but after the installation flash+mss_d.exe got disappeared (maybe automatically got deleted). Then I checked my Kaspersky internet security report to see if there was any other process during the installation and I found an entry with (ssn-xxxxx.bat).  I tried the same thing with vista os, but the installation steps are bit different (including the installer exe filename). So what happened? Is this normal or did I install some kind of a malware? Anyway I'm pretty sure that, installer exe had the adobe systems digital signature.

Thanks for any help!