hmm...i am using Symantec Norton Anti-virus and manually update the virus definition daily
but I have never see any warning from my anti-virus scanner
anyway, the url is pointing to a WMV file, not a web page, so it is unlikely that the adware program came from the WMV file.
From symantec website: Transmission
Adware.180Search can be manually installed or as part of the installation for another program
From what I have learnt in computer securities, the virus enter your system making use of security loopholes of your OS, either the website that you surf previously manage to execute the program on your computer without any prompt, or you accidentally clicked "OK" when there are any prompt to install any web plugin.
I suggest you follow the removal instructions and go to microsoft update to patch any security loopholes