I was hoping to buy Shadow Defender or something similar. I downloaded the trial and it wouldn't install in my 64 bit Vista. I had the same problem with Online Armor except I DID buy it and had to get a refund because it wouldn't work. Are there any replacements for these two excellent programs that WILL work in a 64 bit environment? I have the 64 bit OS so I can see all 4 gb of memory I have. Thank you very much.