Malware/Virus Issue?

My father's laptop seems to being have issues with viruses and/or malware. Google searches end up becoming hijacked when the link is clicked for a search result. Norton has caught at 3 viruses/trojans on several occasions in the past week. And there's some random program that pops up claiming the computer is under attack and is being damaged and directs you to click on one of the balloon pop-ups for help.

I have more info, but I have been unable to post on these forums using his laptop and I'm just trying to get SOMETHING posted. If this works, I'll try and add more info including a hijack this log...

EDIT: the files that Norton quarantined are av.exe, ave.exe and MSASCui.exe. We've tried anti-virus software and anti-malware software, nothing seems to correct this problem.

 

For some reason, I'm unable to post my hijack log, everytime I do so I get an internet connection error.