Would you say anything to your father if he said these things?

A few days ago, my dad was over, and he used my computer. At that time, my computer was running kind of slow, since I had acquired a nasty piece of spyware (that is now fixed, by the way). Well, my dad got ticked off over how slow the computer was going, and he started blaming it on me. In actuality, it probably was my fault to an extent, because I really should have kept my spyware software up to date, but oh well. Anyway, he started harping about how it was because I was running too many "useless" programs on my computer. He saw that I had DViX player and decided that was a useless piece of software, as was the Yahoo IM I use to keep in touch with a few friends who now live across the country. In spite of the fact that my hard drive still 60% unused, that was still part of the problem.