I have had a computer for a while, but have only recently started using it on the internet. I have been using Norton Antivirus since going online, to ensure protection. Everything seemed to be fine. About a month ago, I opened some email forward from my mother, which contained a web link, which I stupidly clicked on. The page stated that I would be redirected, but because of some of the text, I felt it would not be safe to keep it open, so closed the page. I then realized I had received several other messages from my mother and a friend, with nothing in the body of the message but various links, so I figured it's a virus. Ever since opening that message, Norton keeps blocking frequent intrusion attacks on my computer, as evidenced here: https://picasaweb.google.com/andreea1369/September122011.
Here's a sample of a more detailed description that Norton provides on each attack: https://picasaweb.google.com/andreea1369/September12201102.
I have run a full scan through Norton and have downloaded and ran a full scan through Malwarebytes. Both scans show no infections. Since svchost.exe is a process mentioned in Norton (I know it's a normal process), I looked up the attack online and found out that I should locate the process (did so through task manager) and see if it's in an unusual folder. I find it unusual that svchost.exe is listed several times, as in this image: https://picasaweb.google.com/andreea1369/September12201103.
Is that normal? I checked the properties on each occurrence and the last one is located at C:\Windows\SysWOW64, while the others are located at C:\Windows\System32. I realize that WOW64 is a normal folder if I'm running 64-bit Windows (sorry, cannot figure out if that's the case).
I have also read that sometimes the ISP can be doing something to grant this intrusion message from Norton, but I doubt my ISP has been doing this on a regular, daily basis since a few weeks ago.
Finally, I have downloaded Hijack This and it first alerted me that it didn't have access to write in my Hosts folder (is this normal? seems that it may be a built-in Windows security feature) and then I received a log of some 30-40 problems that I don't know whether to fix or analyze, after ignoring the warning and going on with the scan.
Is my computer infected? Should I be posting in the forums where I can submit logs for analysis? Thank you in advance.