How to remove the secondary OS and the files manually?

Bubun Karmakar

Honorable
Aug 26, 2013
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10,630
Hi! I recently changed my primary OS to Windows 8 Essential 64bit. Now I want my old Windows XP SP3 x86 as my secondary OS with this already installed Windows 8 x64 in the same partition that Windows 8 is using. I tried installing Win XP and figured out that some of the files were corrupted so the setup was interrupted in between copying half of the files in my primary Windows Partition. I need to delete those unwanted files as they are taking up my partition space. I tried to select the OS manually by right clicking Computer and selecting Properties. Advanced System Setting and then Startup and Recovery settings. There's no other secondary OS shown in the list. I cannot change the default operating system, there's just Windows 8 set as default. I don't want to install Windows 8 again on this partition as I have important softwares installed on Windows 8. Please Help!