I suspect you have checked your site with IE8. And you may be running scripts without knowing it. You are in fact. They caused me serious problems on slow machines.
on IE it is a lot cleaner.
FF 3.6.13 shows some anomalies on screens of 1024 X 768 but not on 1280 x 720. Try a few - like your local library. Net cafes may have the latest equipment, libraries usually lag and run remote instances via proxy servers - they can show up problems - but ya gotta fix 'em if you want to reach the biggest audience. Whatever I say won't show you the visual problems. Look for yourself.

curretly viewed on WinXp

I check my site on IE5.5 - 8, FF2- 3.6 and sometimes Chrome and Opera (which is a stickler for standards adherence)