Instead of using the Jet driver have you tried using the actual XLS driver to open the file?

Driver={Microsoft Excel Driver (*.xls)};

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I will only tell you how to do it, not do it for you.
Unless, of course, you want to hire me to do work for you.
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Read this if you want to know how to get a correct reply for your question:
http://www.catb.org/~esr/faqs/smart-questions.html
^^Took that from planoie's profile^^
^^Modified text taken from gbianchi profile^^
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Yes Still doesn't work... I don't know why.. the servers are windows 2003 Server

Does this happen with all excel files, or just this one in particular?

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I will only tell you how to do it, not do it for you.
Unless, of course, you want to hire me to do work for you.
================================================== =========
Read this if you want to know how to get a correct reply for your question:
http://www.catb.org/~esr/faqs/smart-questions.html
^^Took that from planoie's profile^^
^^Modified text taken from gbianchi profile^^
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All Excel files.. My procees is, I upload the file .xls to the server and then I load to the webform.