Hello guys please help me.........

In my lappy there is Windows 7 os now i upgraded it to windows 10...
when i am installing this new os i had lost all my data about 200Gb there is a very important files and certificates on which my lifevis depended so please help to recover all or important files suggest me the best way thnaks in advance

please guys Give me the best solution ASAP TIA
waiting :'(

if data is that important, i would suggest you to seek professional assistance.
this could be very complicated if it is recoverable.

TIP.
stop using this hdd, do not power up or start windows, do not install any software on it.

are you from Pakistan or India?

_________________
Data Recovery Pakistan

I am from India bro..there is no professional to help here right now so posted here ..

I suppose the data loss is logical, I mean you have overwritten some folders and partition info, while the HDD itself is OK?

If so, then you can scan the drive, searching for files and folders, which weren't affected by OS install. Proven data recovery software with NTFS support will do. Start with Raise Data Recovery, it's quite easy to use and powerful to find the remaining data at the same time.

Be sure to stop using the source drive completely and save recovered data onto another hard drive.

_________________
• Remote RAID, NAS, SAN, VMware, DVR (CCTV), flash and tape recovery. Data recovery support.

When have you lost the files? Do not use your computer until the data recover, overwritten will cause permanent data loss.
200Gb data loss, I guess you may need to pay for the recover.