Yes, you could lose data, please boot your backup DVD or USB stick and make two full image backups of your data partition before doing anything. If your OS and data is within one partition, oh well, make the two images anyway. Later, going forward, I rather you create 2 partitions, one for OS, one for data. It makes any restore of OS much less "eventful," 'cause your data will not be a part of that OS restore.
Edited by RolandJS, 02 June 2015 - 06:22 AM.
"Take care of thy backups and thy restores shall take care of thee." -- Ben Franklin revisited.
Backup, backup, backup! -- Lady Fitzgerald (w7forums)
Clone or Image often! Backup... -- RockE (WSL)
"I heard Spock finally got colander!" "I believe the word is Kolinahr." "Oh."