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Did you check the load time under the two different servers with the same browser version? The reason I ask, is that some browsers take forever to render nested tables (especially Netscape).
This is not the answer to your question, but it is something to consider.
Just an aside, try getting rid of nested tables - they sloooow down pages a lot.
The page includes a number of nested tables and that seems to be at least part of the problem.
Is your entire page wrapped in an enclosing table? Are all those nested tables inside one all encompassing table for the page? If so, that will cause loading issues as everything inside the enclosing table will need to be read by the browser before rendering.
If the tables are not enclosed in a single encompassing table, then the tables should load from top to bottom or as they are ordered in the html.
If they were working before and not working now after the switch, it sure sounds like a server issue which will probably be answered by one of our Windows server gurus (not me). ;)