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First, Win 8 is not a certified OS to install 11gR2 - Oracle Database Preinstallation Requirements
Which version of Win 8 ? If you have Pro or Enterprise, you will have to install 12c - Oracle Database Preinstallation Tasks
Home versions of Windows are not certified for any Oracle installs.
You will need to download both zip files, then unzip both into a single directory before running setup.exe. Your unzip issue indicates that the second zip file is corrupted.
ok thanks a lot. this was indeed helpful
so you saying oracle 12c is the only certified oracle database software on the windows 8 platform?
Correct - assuming you have Win 8 Pro or Enterprise.
Also, heed these instructions when trying to install
1. Both install zip files will need to be unzipped into one single folder
2. There are no directories with spaces (eg "Program Files") in the install process
3. setup.exe was invoked by right-clicking and selecting "Run As Administrator"
4. do not choose to create the database at the time of the install - instead, choose to install the software only first, then use DBCA to create databases.
The second file what you downloaded is corrupted. Download both files and do the checksum. Extract both files in same location and the proceed installation. As Srini said Try Oracle 12c .