I tried a couple of times to install the Force .com plug-in for Eclipse Helios, but I got the same message. I would like to know if anyone can help me to figure out a solution.

I'm working on Windows XP Professional SP3 and Java.

java version "1.7.0_01"
Java(TM) SE Runtime Environment (build 1.7.0_01-b08)
Java HotSpot(TM) Client VM (build 21.1-b02, mixed mode, sharing)

Error message:

An error occurred while collecting items to be installed
session context was:(profile=epp.package.java, phase=org.eclipse.equinox.internal.p2.engine.phases.Collect, operand=, action=).
Problems downloading artifact: osgi.bundle,com.salesforce.ide.api,23.0.2.201201091635.
MD5 hash is not as expected. Expected: 97a6329f82c422a61e9b1bc28be7cace and found 0df4f6ef0bbf016fdf658a0e3dfd9dd7.
Problems downloading artifact: osgi.bundle,com.salesforce.ide.core,23.0.2.201201091635.
MD5 hash is not as expected. Expected: 1ac3f44231f25642a46a91575f99faf1 and found 518c4102c10d9dbb6bba66eafb28da9a.
Problems downloading artifact: osgi.bundle,com.salesforce.ide.documentation,23.0.2.201201091635.
MD5 hash is not as expected. Expected: e4d7099184e8010c5d235e7f328b2c31 and found eead8681e9a6dd15006612c107f37ef1.

Thanks in advance