While installing Force.com IDE in Eclipse Helios version, i'm getting below given error message.

Cannot complete the install because one or more required items could not be found.
Software being installed: Force.com IDE 25.0.0.201206181021 (com.salesforce.ide.feature.feature.group 25.0.0.201206181021)
Missing requirement: Force.com IDE Core 25.0.0.201206181021 (com.salesforce.ide.core 25.0.0.201206181021) requires 'package org.apache.log4j 0.0.0' but it could not be found
Cannot satisfy dependency:
From: Force.com IDE 25.0.0.201206181021 (com.salesforce.ide.feature.feature.group 25.0.0.201206181021)
To: com.salesforce.ide.core [25.0.0,26.0.0)

Please help me to fix this error and get installation done.