Schnitzu:
Since he mentioned
services.msc, we can assume that he's using XP and not 95, 98, or ME.
Aam94:
My computer runs fine with just the antivirus program checked and everything else unchecked, but yours may not do the same. It all depends on what programs and hardware you're using. You will find anyway that most of them can be unchecked. Read
here and make use of the links provided.