Yesterday all web sites were fine, now some websites are fine, some are slow, some do not look correctly

I am using a Dell inspiron 1525, running Windows XP, Firefox 5.0 both OS and Firefox have the latest patches and fixes applied. Yesterday all websites were loading, responding and appearing properly. Today some are working properly and some are slow and do not appear correctly. No updates were applied in the last three days. To make matters even more confusing, When I us IE, the sites work correctly. I believe it is something with this laptop because Firefox 5.0 works just fine with all sites on a different machine which runs Windows 7. I tried re-installing Firefox 5.0, going back to 4.0.2, 4.0.1, all resulting in the same outcome. I ran a virus scan and nothing was found.
Any insight you can provide would be appreciated.

Hi,
Many site issues can be caused by corrupt cookies or cache. In order to try to fix these problems, the first step is to clear both cookies and the cache.
Note: ''This will temporarily log you out of all sites you're logged in to.''
To clear cache and cookies do the following:
#Go to Firefox > History > Clear recent history or (if no Firefox button is shown) go to Tools > Clear recent history.
#Under "Time range to clear", select "Everything".
#Now, click the arrow next to Details to toggle the Details list active.
#From the details list, check ''Cache'' and ''Cookies'' and uncheck everything else.
#Now click the ''Clear now'' button.
Further information can be found in the [[Clear your cache, history and other personal information in Firefox]] article.
Did this fix your problems? Please report back to us!

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Yesterday all web sites were fine, now some websites are fine, some are slow, some do not look correctly

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