Hello, I recently downloaded a Java Update 5 (as part of the regular Mac OS software update), but just after it was downloaded, Mac notified me some number check wasn't correct (I can't remember the detail) and said the downloaded software may have been tempered with. However, a few days later, Mac OS informed me available update again, and one of them was Java update. I chose to download it again, but instead of downloading it, I found it was directly installed. It seems the original downloaded Java update was installed. Now, I'm very concerned whether I've installed any dodgy program. I tried to re-download Java Update from Apple website, and installed it again. However, I'm still not sure whether there's any malicious program on my computer. Any suggestions? Thanks.