anydvd has probably been identified as a trojan or something cos i dont think its a 'legal' program, as it strips the css protection/encoding from copy protected dvds.

your antivirus would've either put the anydvd program exe into 'quarantine' (ie moved it somewhere) or deleted it.
somewhere in the settings for your antivirus you should be able to 'allow' anydvd or create an exception for it. otherwise, you should change the settings so the antivirus asks you before it takes action (such as quarantine or deletion)