Infopath Web form opens for Windows 7, but not XP

So my problem is that a web form can be opened by my Win7 clients, and any use of the form, such as setting drop box selections, or a little advanced item like searching a user in AD work fine on a windows 7 machine, but if i open the same form on my sharepoint server in an XP machine it opens, but selecting items or searching names, the field blanks out or defaults to the first drop box selection.

in some rare cases if i restart the webclient service, the form works right once, then if opened again it fails repeatedly. I'm just in the desktop dept, but i've been asked to find out why this is the case :( can anyone point me in a direction on how infopath forms services works and what an XP machine with IE7 or IE8 needs to display the form and talk with the server correctly?
DAKEEAsked:
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Michael CarrilloInformation Systems ManagerCommented:
Are you using InfoPath with browser functionality only or with full InfoPath functionality?  If you are using the latter, InfoPath needs to be installed on the systems that are using the form.

I would approach this problem by first ensuring that the XP systems were fully up to date (run Windows update.). Depending on how you created your form in InfoPath will determine if you need InfoPath installed on your XP systems. What version of InfoPath do you have installed on your systems?
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DAKEEAuthor Commented:
It seems that a Steelhead WAN appliance located between the client and the server was casusing the issue. Clearing the data store and rebooting the client side and server side Steelheads resolved the issue.
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DAKEEAuthor Commented:
No other solution resolved the issue.
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