MATLAB: Error occuring during installation matlab 2012a

help meinstallation

this type of error occuring when installation comes to 25%. error – (Jan 24, 2013 18:40:57) Installing Product: Aerospace Toolbox 2.9 (Jan 24, 2013 18:41:30) java.util.zip.ZipException: invalid stored block lengths at org.apache.commons.compress.archivers.zip.ZipArchiveInputStream.read(ZipArchiveInputStream.java:237) at org.apache.commons.compress.archivers.zip.ZipArchiveInputStream.skip(ZipArchiveInputStream.java:261) at org.apache.commons.compress.archivers.zip.ZipArchiveInputStream.closeEntry(ZipArchiveInputStream.java:302) at org.apache.commons.compress.archivers.zip.ZipArchiveInputStream.getNextZipEntry(ZipArchiveInputStream.java:112) at com.mathworks.install.archive.zip.commonscompress.ZipArchiveInputStreamExtractor.extract(ZipArchiveInputStreamExtractor.java:35) at com.mathworks.install.archive.DecodeArchiveInputStreamExtractor.extract(DecodeArchiveInputStreamExtractor.java:34) at com.mathworks.install.input.ArchiveComponentSource.extract(ArchiveComponentSource.java:26) at com.mathworks.install.InstallableComponentImpl.install(InstallableComponentImpl.java:100) at com.mathworks.install.ComponentInstallerImpl.installComponent(ComponentInstallerImpl.java:98) at com.mathworks.install.ComponentInstallerImpl.installComponents(ComponentInstallerImpl.java:58) at com.mathworks.install.ProductInstallerImpl.installProduct(ProductInstallerImpl.java:133) at com.mathworks.install.ProductInstallerImpl.installProducts(ProductInstallerImpl.java:110) at com.mathworks.install.InstallerImpl.install(InstallerImpl.java:100) at com.mathworks.installwizard.model.InstallTask.execute(InstallTask.java:42) at com.mathworks.installwizard.model.AbstractBackgroundTask.call(AbstractBackgroundTask.java:82) at com.mathworks.installwizard.model.AbstractBackgroundTask.call(AbstractBackgroundTask.java:26) at com.mathworks.wizard.worker.WorkerImpl.doInBackground(WorkerImpl.java:24) at javax.swing.SwingWorker$1.call(Unknown Source) at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source) at java.util.concurrent.FutureTask.run(Unknown Source) at javax.swing.SwingWorker.run(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source)
(Jan 24, 2013 18:41:30) The following error was detected while installing aero_common:
invalid stored block lengths
Would you like to retry installing aero_common? If you press No, the installer will exit without completing the installation. More information can be found at C:\Users\CHANDR~1\AppData\Local\Temp\mathworks_chandramauli.log
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