Anti Virus Help

I have been trying to download the anti virus trend micro and or AVG anti virus and my computer won't do it' It will go to the site but when I try to download it I get a can't go to this page sign.. I had norton and a friend told me to delete the norton and then try again to download the virus trend or AVG and it still won't and since I did this My system restore won't come up now and I have lost the font section in my E-Mail.. Help..