Most of the time, people can still use their computer even after losing some files
. But here is what you need to do. You must not use your computer as much as possible to avoid making the deleted data overwritten. Once a file is overwritten, there is no way to recover it even with the recovery software. So, the minute you delete the data mistakenly and realize it, please stop writing more data on the partition and use a recovery software as soon as possible. There are data recovery software which show the data to you which you are trying to recover before paying anything, so there are no risks involved.