Antivir is free like AVG for personal use but has had fewer reports of dissatisfaction with speed or false positives. If you don't want to run real time monitoring the Open Source communities Clam is a good option. If you do get a possibly false positive then try submitting the file to this site which runs most of the major checkers on it and lets you know which ones don't like it. http://virusscan.jotti.org/en
click srart, click settings, click control panel, click java, click remove,.....search for sun java, free download, follow directions to reinstall
there are many anti virus software that have listed here, and I just want the most useful and efficient software. please list some of these that i can use trial or free. thanks