First ClearCase 7.1.1 is not yet officially supported on Windows7.
CCRC (the remote client) is supported, because it only uses snapshot view (CCWeb view) which works on W7 (only dynamic views are not supported yet)
Finally, the "update" site for CCRC 7.1 should be, according to this IBM post:
http://yourserver:12080/ccrc/update
But that is actually only working for 7.0, not 7.1
(And, as mention in this upgrade process, you will need to install GEF as well.)
With a CCRC server 7.1.x, You must use a full RCP CCRC 7.1.1 client available on Passport Advantage.
You have two configurations:
You have installed a full ClearCase client (not the remote client, the complete client), because the VOB server is not "too far" from your workstation.
Then, in that case, you can add an Eclipse ClearCase plugin. See this question.
It is not a CCRC plugin, but a full ClearCase plugin.
You have not ClearCase on your workstation. Then the only solution to still access some ClearCase view is a remote client.
With ClearCase 7.1, you only have a standalone version of the CCRC, not an Eclipse plugin version.
You had an Eclipse CCRC plugin for ClearCase 7.0. But not for CC7.1
So you need first to qualify your situation. Do you have (independently of Eclipse) a full ClearCase client already installed?