You can also try Knoppix or Fedora Core. At least yun, di kaya ng mga malwares like that.
I'm using Vista Ultimate right now, so far, ok lang sya. My PC is quite ancient. Tuwa ako na gumana pa ang Vista. P4 3.0HTT, 1GB, 840GB, 9800Pro 128MB. Medyo weird lang at di nya kaya ang 1920x1200 resolution ng monitor ko. Hanggang 1800x1440 lang
try mo rin palit ng Anti-virus to AntiVIR. used AVG before, this AntiVIR is better.