Windows 7- Browser ajax event scheduling doesn't work.

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  A website I frequent uses ajax to instruct client browsers to send and XMLHttpRequest to check for updates of new posts to the forum.  While this info is from using Firefox, I also have the same issue using IE, Opera, Chrome. Doesn't seem to matter which browser.
  
  I am using Firefox 3.5.7 with JAVA build 1.6.0_17-b04 and the same version of flash, etc.
  
  One system has Windows XP, the other is Windows 7. On the Windows 7 client I have also tried to use 64 bit browser and java but still have the same issue.
  
  The XP system will initiate the XMLHttpRequest every 3 seconds or so as it is supposed to, but the Windows 7 system will never initiate the request.
  
  I have used an HTTP sniffer to capture the request on the XP system and have also used various tools to test all of the plugins, java, ajax etc. on the Windows 7 system and against the site. All check out ok.
  
  SO the question is, with everything being the same version, why won't the Windows 7 system ever initiate the request as shown below?
  
  The site admin is at a loss as well why only Win 7 clients have this issue. I appreciate any input someone may have.  Thank You!!
  
  This is the request and response stream from the XP client.
  
  REQUEST: This happens every 3 seconds or so.
  
  POST /forums/ajax.php?do=shownewresponses HTTP/1.1
  Host: www.kingbubba.com
  User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.7) Gecko/20091221 Firefox/3.5.7
  Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
  Accept-Language: en-us,en;q=0.5
  Accept-Encoding: gzip,deflate
  Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
  Keep-Alive: 300
  Connection: keep-alive
  X-Requested-With: XMLHttpRequest
  Content-Type: application/x-www-form-urlencoded; charset=UTF-8
  Referer: http://www.kingbubba.com/forums/showthread.php?p=111988
  Content-Length: 129
  Cookie: bblastvisit=1261861860; bblastactivity=0; bbsessionhash=c8d40ad2a4183aac4ae06804cb8c6962
  Pragma: no-cache
  Cache-Control: no-cache
  
  securitytoken=1263165064-3bf1e7c98a9f334330eefb311bd0ac3f8e968be8&threadid=1320&ajax_lastpost=1263164956&ajax_lastedit=1263139805
  
  RESPONSE:
  
  HTTP/1.1 200 OK
  Date: Sun, 10 Jan 2010 23:11:59 GMT
  Server: Apache/2.2.14 (Unix) mod_ssl/2.2.14 OpenSSL/0.9.8i DAV/2 mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635
  X-Powered-By: PHP/5.2.11
  Cache-Control: private
  Pragma: private
  X-UA-Compatible: IE=7
  Keep-Alive: timeout=5, max=86
  Connection: Keep-Alive
  Transfer-Encoding: chunked
  Content-Type: text/xml; charset=windows-1252
  X-Antivirus: avast! 4
  X-Antivirus-Status: Clean

  Monday, January 11, 2010 5:57 PM