possible virus blocking internet

/hi,

This is for my boss's pc in the office.  For some reason, internet connection will not be available some time after rebooting.  It would work for a few mins then stops.  He can still access network drive.  When open Network from control panel, it is connecting to internet.

He has norton and malwarebytes installed.  Nothing was detected.  I booted into safe mode and run Spybot and will run Emsisoft later.

Spybot caught a few more.  What would be the next step?  Which AV would EE suggest to run?  thanks
mcrmgAsked:
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JohnBusiness Consultant (Owner)Commented:
It still could be a virus and you say you are still checking.

Try TCP/IP Reset and DNS Flush. That may also fix the issue.

Basic TCP/IP Reset

Open cmd.exe with Run as Administrator
Then  netsh int ip reset c:\resetlog.txt
Also, ipconfig /flushdns followed by net stop dnscache followed by net start dnscache
Then restart the computer

Please let us know.
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CompProbSolvCommented:
"internet connection will not be available...": how are you determining this?  Is it just that you can't browse the internet by name with a web browser?

Run the following once the internet is not accessible and it will tell us a lot:
Start
Run
cmd
ping 4.2.2.2
ping google.com
exit


If "ping 4.2.2.2" gives proper replies, then you are getting to the internet by number successfully.

If "ping google.com" gives proper replies, then you are getting to the internet by name successfully and it is an issue with something interfering with the browsers.

If you'll let us know the results of those two pings, we can direct you to the next step.

In addition to what you have run, I'd scan with SuperAntiSpyware (free from download.com).
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Fred MarshallPrincipalCommented:
Why do I suspect Norton?  Perhaps you should.  This sounds like a broken firewall problem as much as a possible parasite problem.
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mcrmgAuthor Commented:
I followed all the steps EEs showed me.  When I turned off Smart FW in Norton, all the traffic is on..thank you
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