The question should be related to browser versions rather than computer systems and you should name the specific browsers and versions you need to support. vague general question will get very few pertinent answers and generally encourage more fluff posts in reply. However 2 members have had good attempts at answering although they both could not pinpoint your requirements.
If you are talking about "accessibility" then that is a different and more involved question altogether and goes into the very basics of how your site is constructed and what accessibility features you have installed for all users regardless of ability.
more detail is the website itself <snip></snip>so that you can check yourself
i need support that why i am posting small question that are my current problems and i hope this post is at the right place
thanks for your time
Apologies if this is wide of the mark but it looks even more like spam now with the link to your site and still no specific or detailed questions. You have built your site using html5, media queries and quite sophisticated CSS yet you ask a question that seems to infers no knowledge of css or html at all. Whoever built the site will have a clear knowledge of what browsers it was designed to work in and what needs to be done for older browsers. If you didn't design the site yourself then those that you commissioned to build the site would have knowledge of these matters and the details should have been built into the brief.
I'm closing this thread but feel free to post again with a correct description of the problem you are having and make sure to post in the correct forum. You posted in graphics yet you mention accessibility but the question really seems to be browser support which would be more suited to the CSS and layout forum.
Your question should be phrased more like this:
"I need my site to work in IE6 but the right column has dropped down below the content. Is there an easy fix to this.?"