\"Installer corrupted or incomplete.
This could be the result of a failed download or corruption from a virus.\"
Could it be more obvious... *sigh*. Sorry, I just find it fascinating, aswell as dumbfounding, how so many people just ignore the message and give up because it doesn\'t work.
If it could be the result of a failed download, why not try redownloading parts untill it works? If it could be corrupted by a virus, why don\'t you fire up Norton or whatever you use and run a quick scan?
There\'s a tool on the downloads page which can check your .part files for corruption, but as you said you arn\'t really familiar with computer stuff so I reccomend you just follow what I said at first and redownload it all.