Please help on this problem. I got the following error message (pasted below) while trying to install Force.Com IDE on Eclipse. I tried on three different machines and two versions of Eclipse but got the same error. Thanks.

An error occurred while collecting items to be installed
session context was:(profile=epp.package.jee, phase=org.eclipse.equinox.internal.p2.engine.phases.Collect, operand=, action=).
Problems downloading artifact: osgi.bundle,com.salesforce.ide.api,25.0.0.201206181021.
MD5 hash is not as expected. Expected: cfe2af79a543696580b0dc8120ae63ea and found 51dc4152445563a0cf707399b18366cc.
Problems downloading artifact: osgi.bundle,com.salesforce.ide.documentation,25.0.0.201206181021.
MD5 hash is not as expected. Expected: 314d2f02d4c7e63caaff7feff76dcd87 and found 40018475a97480482fd77be466fe5cb5.