you might not have have enough graphic memory available. are you running something else that might be interfering with its productivity?
wait... if you're good with IE and it's just firefox that's giving you issues, up on the tool bar, drop down the 'tools', and choose 'options'. under options you have item choices - main, tabs, content, feeds, security... etc. click on the 'content' icon. there's a list of items that will be checked, or not: "block pop-up windows", "load images immediately" ... is the box check for 'load images immediately'? if not, check it and see where you are.
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wait... if you're good with IE and it's just firefox that's giving you issues, up on the tool bar, drop down the 'tools', and choose 'options'. under options you have item choices - main, tabs, content, feeds, security... etc. click on the 'content' icon. there's a list of items that will be checked, or not: "block pop-up windows", "load images immediately" ... is the box check for 'load images immediately'? if not, check it and see where you are.