More than likely you had viruses on your computer BEFORE you downloaded/tried the trial, and your virus scan is just picking up on them.
Or if the "virus scan" looks fishy, it could be a fake virus scan that came with another recent download.
I don't understand for sure what the problem is, but good luck to you and I hope this helps you.
I sincerely doubt he picked up those viruses from the demo on minecraft.net. He might have picked up those viruses from a malicious advertisement which may or may not have been from minecraft.net (I'm not sure if they have adverts as I always use ad blockers).
Another possibility is that he already had a virus the antivirus was not able to detect which downloaded other viruses.
your the one thats not getting it, lol. it happened on his pc, not mine.
and this started when he downloaded java 7 and started playing minecraft.
his pc was fine until he installed java and ran minecraft, so yea, dont say its impossible, mc is popular, and hackers always go for the big guys, like mojang.
It's more likely due to Java having some major security holes (as been stated again in the tech world recently) rather than the Minecraft demo being infected with some sort of backdoor dropping malware on the client. Make sure he is fully up to date on all his plugins/programs and OS updates and has good and properly set up anti virus/firewall products. Also make sure the computer is completely clear of any old viruses, formatting the harddrive is pretty much the only way to be sure of this.
You have to be aware that every software contains bugs which can potential be exploited by hackers to install malicious software on your system even though you have done everything you can to protect yourself. Having things like Java/Flash/you name it always increases the risk of a hacker finding a weak spot in your computers defense.
I still doubt the Minecraft demo itself is infected.
Something doesn't become an the most popular indie-blockkbuster that has ever come into existence by having virusses in it's demo. Also, if someone were to hack into Mojang, they would more likely steal all personal information on the system, re-route the payment section or take down the servers entirely rather than put a few virusses into the demo-download. I think hackers have much better things to do, and if something so large-scale as hacking into a massive company happened, the press would make a mountain out of it and everybody would know.
EDIT: He's not using macintosh, is he? Java on mac has some major security flaw at the moment apparently.
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I'm willing to bet neither you, nor your father know what you're talking about. There is absolutely no way to prove he got these viruses through Minecraft unless he was willing to format his HD and start absolutely clean ensuring that the very first website he went to was Minecraft.net.
I'm willing to bet you (or your father) are just looking for a way to cover up your viruses obtained from... questionable interests?
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So you're running XP and Java? Please tell me you at least use an updated version of Java.
There are so many flaws both with Windows XP and Java I'm not surprised he's picking up viruses left right and center. Once again, I sincerely doubt they are caused through Minecraft. Go format, install only the programs required (A browser and Java) and try again.
Oh and I'm not surprised you get hit by several viruses at once. Most malicious adverts just detour you to their server and start 'bombing' you with tons of potential exploits. Some won't work, others will. Because of the sheer amount of exploits you'll probably end up with way more than the 5 viruses your antivirus caught.
Strongly advice you to format your harddrive and get a fresh install. Probably got one or several nasty backdoors just waiting to drop more viruses.