Why can I not access certain web sites?

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I am not able to access any google site that I have previously visited, i.e. Gmail, maps, google search, etc. The internet browser doesn't open them. However, some google pages that I did not visited before can be open, i.e. videos, news, etc.
I uninstalled a websync program from google when i was trying to clean my computer. Do you think is this the reason? What can I do to get this fixed as I use gmail quite much.

Thanks, V.

The items above do not quite address this problem. Two months ago, some web sites became inaccessible, and now it is random, sometimes the ones that were not are, but it is never consistent, and sometimes takes a lot of work,i.e. over and over again using a little different techniques and finally hitting the site, though some are not accessible at all). This computer is used for business only. Using Windows XP2 (upgraded to V.2), cable modem connected to router. Have tried everything, uninstalled Norton Antivirus and Norton Firewall (expired not long before these problems began), installed new antivirus Avast!, got a new cable modem, cleaned out browser history, cookies, temp files (am doing this sometimes twice a day to access certain secure sites such as banks), using AOL for email, and the browser, also using IE7 browser, usually when AOL's doesn't work, but IE7 also sometimes doesn't work (see above), have talked with AOL, one of the Banks' online support people, and Dell (Dell wants me to reformat harddrive again,this was done 1-1/2 years ago and am trying to avoid this). Unplug the router and modem, restart the computer, all the secure settings are checked in IE7 InternetOptions Advanced, tried resetting IE Internet settings to default, am adding secure sites to Trusted zone which is set to Low, set Internet settings to "never dialup a connection". Will try the suggestion for the MTU, but have High speed cable connection. What is the next step?

Adding on to the previous, have also tried Modzilla, with no improvement. This is a critical issue for the business.

I could not access one wibsite in home. I used 3 different computers, all were the same. but I could get the wibsite with the same computer in my office. So I guess it is not the computer problem. I contacted the internet provider, verizon fiber optic, it said that my ip is blocked by the website. I contacted the wibsite management, the wibsite said it does not block anybody. do you know what is going on?

I comment on many sites (blogs) out of the blue there is one I have always posted to that I can no longer. It's almost a read only. Any thoughts?

cannot access any antivirus web page

I read www.azfamily.com and used to be able to read and post comments from my work computer. Now I can't even see the coments. Is this a script that was written by my company administrator to prevent that? How can I get it back?

I don't know if this will help but I had taken my computer to be repaired for a virus. I had McAfee Site Advisor on it. When I got my computer home, it wasn't there anymore. I called the repair man but he denied removing it but acknowledged that he didn't necessarily repair the computer himself but gave it to someone else who works for him. I'm now unable to get on the Site Advisor website. I think they deliberately removed Site Advisor and blocked me from downloading it again so I could increase my chances of accidentally selecting a bad site so I could end up bringing my computer back to them. One even reluctantly admitted to be verbally that the less protection their customers have, the more business they would likely get.

i cannot access my website australian souvenirs website and after i format my computer and reinstall zonealarm i cannot access my website. i tried on another computer it it seems fine. help please to fix the zonealarm settings or tell me what the problem is. thanks

I just got a new computer9 well used but new to me from a computer shop and I can not send e-mail cards like love cards or Birthday cards like I could on my old one why? any ideas? Sites like riversongs I love the cards they have please help me to change setting if that is what it is

thanks
Kandis

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