Can't open some web pages Windows 7

Normally I'd just reboot the router but this has already been done.
can't open www.adobe.com
can't log in to Charter.net web mail.
Have run a variety of parasite removers and have found not much interesting or a solution.
Have checked firewalls.
In this case using Charter F-Prot? Internet Security suite.  Can't find anything to change.
Problem occurs with both Chrome and IE8.

Looking for new ideas.
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Fred MarshallPrincipalAsked:
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Fred MarshallConnect With a Mentor PrincipalAuthor Commented:
I did all the typical things.
The ISP is a big cable company and none of their tech support people had been able to help.
I took the computer to another site using another ISP and it works fine.
Suspected the cable modem.  Prepared to order a new one.

The user contacted the ISP local field service guy.
I returned the computer expecting that a new modem would be ordered.
When I returned the computer, everything worked fine with the existing cable modem.

I suspect the local field service guy did something somewhere external to the site.

I have seen this same thing happen a number of times.  It's usually fixed by rebooting the resident router or modem.  I can't say I've ever seen it happen this way.  Usually external/local problems exhibit with no internet service at all.  So, this was indeed hard to track down / diagnose.
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Chris StauntonConnect With a Mentor Commented:
First thing I would do is check to see if you're able to resolve names, drop to a command prompt and type nslookup, then from the prompt see if you can resolve addresses like google.com.  If you are able to resolve google.com try the adobe address and see if that works.  

If you are unable to resolve addresses I would try to "repair" the ethernet adapter.  Right click on the adapter and select repair.  If this still doesn't work you can try a netsh interface ip reset > reset.txt

Hope this helps!
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BobRalphConnect With a Mentor Commented:
Have you tried clearing history, cookies, and temp files on each browser? Also, have you installed any new software recently?
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BxozConnect With a Mentor Commented:
Check your hosts file in C:\WINDOWS\system32\drivers\etc
Some virus can edit this file
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Fred MarshallPrincipalAuthor Commented:
I appreciate the inputs.  I'd already done those things as a matter of course.  But they are good suggestions so gave points.
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