When I try to use the GWT dev mode plugin for ie 8 on Windows Vista I continually see the prompt to install the plugin. 
After running the plugin I still always see this page. Does anybody know of how to troubleshoot something like this?
Troublshooting guide for GWT plugin
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See this : Can't install gwt developer plugin for IE 7 or 8
Manually running regsvr32.exe oophm.dll fixed the issue for me.
What GWT version are you running?
Try to install the plugin from here:
http://gwt.google.com/samples/MissingPlugin/MissingPlugin.html