Make sure you have not disabled something in IE.
Internet Options>Advanced Tab>
Click "Restore advanced settings"
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You must use the Adobe uninstaller (see web page below) before reinstalling flash player.
http://www.adobe.com/cfusion/knowledgebase/index.cfm?id=tn_14157
then install Flash Player
http://www.adobe.com/shockwave/download/download.cgi
Test Adobe Shockwave & Flash Players
http://www.adobe.com/shockwave/welcome/
Download and Install Adobe Shockwave if it does not appear in above test
http://www.adobe.com/shockwave/download/
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JAVA
Current version is 6 Update2. Update Java or download at
http://www.java.com/en/download/manual.jsp
for Firefox
http://www.java.com/en/download/windows_xpi.jsp
In add/remove programs remove all but the latest version of Java. Old versions are a security risk. Then Go to Program Files\Java remove directories of older versions. (jre1.5.0_08, jre1.5.0_09, etc.)
Check to make sure you are not running Microsoft Virtual Machine (Microsoft Java, no longer supported and should be removed).
http://java.com/en/download/help/uninstall_msvm.xml
Now to enable Java:
Internet Explorer:
Internet Options>Advanced Tab> Scroll down to Java
Make sure "Use Java X.XXX for ..." box is checked
Firefox:
Tools > Options > Content > Check all four boxes