was on computer last night an i came up with this message of trojan horse detected abort connection when i done a scan i comes up with no infected files, does this mean iv got virus or have i been lucky im usless on computers an have no idea what im doing sorry if im being stupid was it just warning me or has it got into my computer some how??? 
The abort connection is a web shield detection and by aborting the connection (only for that item) avast stops it being downloaded, so it isn’t unusual to find nothing. Though you were right to scan as some browsers or file download managers might continue with the download even after an aborted connection.