Avast Free Antivirus 5.1.889

- solved a compatibility problem with CorelDraw X5
- solved a compatibility problem with Acer control software
- solved a problem inserting a license file via the installation wizard
- solved a compatibility problem with some Dell wireless network adapter drivers
- solved a compatibility problem with Game Guard (used by a number of games)
- solved a compatibility problem with Sibelius
- solved various 0xC0000005 and 0xC000007B errors (e.g. with some .NET applications)
- issues related to upgrades from v5.0 (inactive shields, missing right-click associations, missing 64-bit boot-time scanner etc)
- solved some possible deadlock conditions (relatively rare but possible)
- performance related improvements
- various UI related improvements