Wasn't it installed with an msi of some sort? have you tried pushing an "install package" that's actually an uninstaller? i.e msiexec.exe is your setup file. In the parameters...
An error occurred while collecting items to be installedsession 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,24.0.0.201202291629....