Is there a program for Windows Vista that does what Dial-a-Fix does for xp?

My husband’s pc runs windows vista (ha!ha!) He is experiencing dll/dns errors and can’t access internet except thru one shortcut on his desktop for yahoo mail. I believe his pc is infected, and am working on that belief- his firewall was down. When I first attacked his problem, I tried system restore, but it didn’t work- said there was a problem restoring one/more of his files. Then I thought dial-a-fix, but that’s for xp. Norton says he’s clean but I will try it again, I’m also going to transfer malwarebytes over and try to run that. But if there’s a vista-version of dial-a fix, or if anybody has any suggestions, please let me know. Thank you, Cynthia.