I have no problem with this plugin (except that the MVFS layer does not work, since dynamic views are not yet supported on Windows 7) if you have an exact tree
yourEclipse eclipse plugins com.rational.clearcase.help_7.5.0.v200910221234 com.rational.clearcase.activities_7.5.0.v200910221234 com.rational.clearcase_7.5.0.v200910221234 features com.rational.clearcase_7.5.0.v200910221234 com.ibm.rational.clearcase.ccrefresh_7.5.0.v200910221234 com.ibm.rational.clearcase.ccimport.feature_7.1.0.v200905202348--08422A2_242663
So you can start and check if you see this configuration.
Note. I install it only on Eclipse Galileo 3.5 and Eclipse Helios 3.6Mx.

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