Cannot install gwt plugin in Eclipse with Windows 7 64-bit

I'm trying to install Eclipse plugin for GWT and follow the
instructions step by step as following:

- Download and install Eclipse 3.6 Helios
- Choosing >Help >Install new software... adding the address
http://dl.google.com/eclipse/plugin/3.6
- Here I see GWT plugins and >Select all, and >Next

Then I get the following message:
Cannot complete the install because one or more required items could
not be found.
Software being installed: Google Plugin for Eclipse 3.6
1.4.2.v201012211742
(com.google.gdt.eclipse.suite.e36.feature.feature.group
1.4.2.v201012211742)
Missing requirement: Google Plugin for Eclipse 3.6
1.4.2.v201012211742
(com.google.gdt.eclipse.suite.e36.feature.feature.group
1.4.2.v201012211742) requires
'org.eclipse.wst.common.project.facet.core 0.0.0' but it could not be
found

My computer is a Windows 7 Enterpise, 64-bit and it feels likes this
might be the problem and I am sure there is solution. Do you know how
to get GWT working here? Many thanks.

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