1.I just switched from Anti Vir to Avast and noticed my computer slowed down significantly. Even my startup has slowed. I tried normal settings and still it is slow but it did help some. Is Anti Vir really worse tha Avast. I just want the best free version of virus protection I can get. 2. If Avast is slowing me down what else do you recommend. I went to a Virus Bulletin site and I was wonering for free home virus protection sofware which is most effective for xp sp1.