Webuser Forums: cannot upload pctures anymore

i used to have an old desktop until two weeks ago when i changed to a laptop (forgive me i know nothing about computers..) it is a Packard Bell EasyNote PB57C00001. my problem is, if i go to one of my regular sites i cannot upload a jpeg image anymore. all the pictures on the laptop are jpeg..if i try to upload one, i get the message to please upload a different image as this one isnt jpeg?? i thought it was a problem on the site so i sent an email and they didnt know what i was talking about. i went to a different site and that was the same. basiclly a long story short i cannot upload any images to any site (i am talking bout a site such as www.communities.com ) is it my settings? i have firewall on,cookies enabled (like they ask) and i have pop up blocker,ad muncher,and norton internet security.(but i had all these on my old desktop with no problems..) i forgot to mention, i am on windows xp,and if i try to upload from my husbands computer there is no problems. thankyou in advance..

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