Hi. I changed my laptop’s Windows. It was 7 and I installed another Windows 7 to enhance its performance. Unfortunately, I suddenly realized that one of my important drives in my computer has been lost. Is it possible to me to recover this drive and its information?
Don't backup your files regularly?
Re-installation system couldn't affect the data in non-system partitions. If you lost the data on system or boot partitions files, please check this article.
http://www.easeus.com/data-recovery/data-recovery-software/free-recover-data-after-system-restore.htm
lost like formatted?
partition find and mount
http://findandmount.com/
Dump it in an external case and/or access it ussing a CD-based linux distro (like Puppy.)