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Dell computer operation system upgrade

"i have an dell computer, it is very light and thin with red appearance.but recently i  asked my friend to upgrade my  computer system manager version from 7 to 8.0, but what makes me confused is that i can't find my files in disk d later, and i did back up my files in computer, the file is really very important to me.because the 8.0 dosen't have partition, my files are in disk D before upgrade.who can help me and tell me what should i do to get back my lost files?Thank you ,in advance"

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