Help showing page of posts in 4 columns

a:
styling posts into columns is mainly a html/css issue;

b:
general approach: give each post div a fixed width, and a float:left – as you have done with your column inline styles (try to avoid inline styles, as they are much harder to debug with tools such as Firefox’ web developer add-on);
in the loop, add a clear:left to each first, fifth,… post div, possibly by adding a corresponding css class to the div;

c:
if you really want to dump the posts into columns, you need a special loop structure – for example see my post – but this is usually not necessary.

you can paste the full code of your template into a pastebin and post the link to it here – HOW-TO – ad someone might be able to make some suggestions.