can't download after internet security 2013 removal

i have been working on my buddies laptop. he brought it to me saying that he can't do anything with it due to nonstop error messages. upon my inspection of his laptop i found that "internet security 2013" had installed itself. i read your forums here and followed the advice to remove this. i rebooted into safe mode with networking, installed and ran rkill from a flashdrive due to his laptop would not download, installed and ran tdsskiller from flashdrive, installed and ran mbam from flashdrive and removed numerous issues that were found. i then rebooted (again into safe mode with networking) as prompted and then attempted to download secunia psi from his internet explorer, but it still says "can't be downloaded". what am i missing or doing wrong ? could it simply be that this "internet security 2013" made changes to his computer so it won't download ? or does this mean there are still virus issues lingering ? he is running windows vista on a dell laptop. help please.......

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