Yahoo network error 44

We have a client that is having and issue since 9-26-13 using yahoo web mail. Whenever he logs in, every message that he opens gives him the following error:

"Network Error Yahoo! Mail was unable to connect.
        Please reload the page or verify that
          your network connection is active"

If i try to log in using my personal yahoo mail account, it give an error code 44. It will intermittently give the error 44 on his account.

His account is accessed perfectly from another computer on the same network, as well as a computer on a different ISP (my office). We have narrowed it down to his computer specifically. It has the same problem in every browser (IE and Chrome)
On his computer we have done the following: reset both IE and Chrome, used IE in safe mode, released and renewed its DHCP lease, ensured that his computer has the same DNS settings as the others (which it does), disabled our managed AV and was able to verify that is was disabled, checked to see if there was any other security software installed (there is not), Doing a virus scan and malware scan tonight but they have both been done recently 9-25-13. no updates have been installed since 9-15-13.

This is a weird one, Thanks in advance!
Jordan SmithAsked:
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Steven HarrisPresidentCommented:
Have you checked the host file to make sure there are no erroneous entries?
Jordan SmithAuthor Commented:
Host file is empty.  After running a AV scan it looks like there is some infection.  Once I resolve this, I'll post back with a status.
Check whether you are able to access yahoo mail in safe mode with networking. If you able to do it then try problem might be caused by startup entries,

Clean boot.

Clean boot process

Start-type - msconfig- click on startup tab- click disable all...then click services tab- put a check on hide all microsoft services ...and then click disable ok and then restart the computer in normal mode.

If everything works fine in clean boot then enable five startup items and services at a time to find the faulty software.

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Jordan SmithAuthor Commented:
Two issues came up. I removed some malware that was detected.  I also corrected a Registry Entry for according to the following forum post:

"Finally fixed it. Set the DWORD http value to 3 on website policy domain list.

HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\Domains\"website domain"."

All is working now.  I think we should be good to go.  Thanks everyone for the input!

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Steven HarrisPresidentCommented:
Glad you got it fixed!

Make sure to mark your last post as the solution and include any supportive posts so that others users may gain help from your findings.
Jordan SmithAuthor Commented:
Resolved issue myself.  Thanks to ded9 for pointing us towards malware.
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