IE7 Problem!

My site works fine on all browsers, well thats what I thought! I'm not really a fan of MSIE but last week I finally got around to checking my site in IE7. That when I notice the problem. All the frames are about 1-2% different from what they surrposed to be. On one page this causes a bit problem because i have i have disabled boards and scrolling on one frame and this problems causes some text to cut off. I could extend frames by 1-2% to solve this problem but this changes the design in all the other browsers and makes it bigger that I planned. The only way I can think to solve this problem is not use frames. I'm just wondering what is causing the problem have, I done something wrong?

Could you provide a link to the page/site in question? IE7 should be more standards compliant then its predecessor and a number of rendering bugs have been solved so if anything, I'd expect it to be more in line with the likes of FireFox and Opera.