- higher performance of the scanning engine (especially on new CPUs) and faster start of the avast! system service on OS boot
- improved support for Windows Vista (added support for NTFS transactions (also known as TxF) etc.)
- improved detection of full-screen applications
- fixed a bug related to the demo licence not being installed during silent installs
- improved compatibility with Windows offline folders
- more improvements in executable unpackers
- minor fixes in the ZIP unpacker
- fixed Runtime error R6034 messages when Mozilla Thunderbird version 3.0 is installed
- suppressed double scans when the user selected a local disk scan plus a folder scan (with the folder residing on the local disk)
- added Catalan language module