Websites not displaying properly after reset - Strange horizontal bars across screen.

Hi all,
Recently AVG updated on my PC. I'm normally on the ball with things like this and always prevent the add ons self installing such as free search tools etc but this one slipped past me. The end result was that whenever I opened a new tab AVG had hijacked FF and I was presented with an AVG search page. Tried getting rid of it without success so reset FF.
Since doing this some (not all) sites have display problems. The most affected seem to be Ebay and FB. What happens is after the page loads and I scroll down most of the page dissapears behind horizontal black and grey bars. It certainly wasnt like this prior to the reset so something has obviously gone afoot in settings but I could do with some help as to which settings need to be re tweaked. If it helps I can grab a screen shot of the problem and host it.
In case its relevant I'm running Win 7 64bit ultimate.
Many thanks, Chris

You can try to disable hardware acceleration in Firefox.
*Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"
You need close and restart Firefox after toggling this setting.
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

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Last-Modified: Thu, 24 Jun 2010 08:52:04 GMT
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Accept-Ranges: bytes
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.working a        { color: #514e4e; text-decoration:none; }
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.splitB a        { color: #514e4e; text-decoration:none; }
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.splitB a:hover       { color:blue; text-decoration: underline; }
.thumbContainer       { float: left; width: 570px; overflow: hidden; }
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.bottomright        { width: 24px; height: 20px; background: url(../images/bottomright.jpg) no-repeat; position: absolute; top: 87px; right: -18px; }

Before doing any worrying about layout problems, please fix the errors shown here -
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Websites not displaying properly after reset - Strange horizontal bars across screen.

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