is ur anti virus up-to-date? well if not, you'd better update it fast.. or try different anti virus softwares, in some cases other anti-virus software detects viruses,trojans or whatever that other anti virus cant detect...
i first started using my very first computer when i was in the 4th grade... it's operating system is windows 95 and i was just using it to play games... like lion king, b-thorne, batman etc... my uncle taught me the basics...