LG Wireless Phone - Suddenly, I am not able to access certain websites on my computer, but my internet connection is fine. Ideas?

Suddenly, I am not able to access certain websites on my computer, but my internet connection is fine. Ideas?

Suddenly, I am not able to access web twitter on my computer at homw on any of the browsers I've tried: explorer 8 which is my default browser, firefox and even google chrome which I installed for testing purposes. I can access twitter via hootsuite.com. I am also able to access twitter via twitdroid on my phone using the wifi on my home connection. It looks like something is preventing twitter from connecting. It would load the website, soon after I've rebooted my computer but then I am not able to post any updates from it and the website wouldn't load until I reboot my computer and it just loads that one time. I also have tweetdeck on my computer: It feeds my timeline through but I am not able to post any updates also, message freezes or triggers a 'network error' as if I don't have internet going through it, although I am still able to see the updates of the people I am following. I have disabled my firewall for a very brief moment to see if that was causing the problem but it's not. Other than that, my internet connection is fine, quite fast, 10 meg, can access all other websites but not web twitter. Anything I need to check. I've rang both my isp (plus.net) and my router (belkin) people, but they told it's beyond their remit and they haven't been able to help me. Any pointers you may have would be greatly appreciated. L x p.s my anti virus is fine, it didn't detect any problems and I havent uninstalled anything lately. thank you Thank you very much kojak. I am sorry, I am not quite sure how to reply to your answer. I have medium security and I have also cleared my temporary internet files, cookies and cache (well from internet explorer 8 that is) I dont understand why suddenly it has stopped working

Public Comments

Go into the computer's security and check the level of security you are at
Go to the time / time zone /date settings on your computer and make sure GMT is set correctly.
Optimize browser using some good cleaner such as McAfee secured RegInOut Cleaner. thanks