problem ubuntu software center,linuxdcpp

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http://www.ubuntux.org – i've been using ubuntu9.10 since 1 month. But recently due to some error in installation of google desktop(package is partially installed),The package installer is giving the error that there is already a program running in software center/synaptic package manager,so it cant install any package. when i try to install anything through software center it is telling that"waiting to other software managers to quit". also linuxdcpp is very slow and is very often getting struck. i cant give this wonderful os for these two resons.please help me. (Distributions)