Serious Trouble with Kingston Flash Drive

I am having two types of problem with my Kingston 16 GB flash drive:
1. When I connect my flash drive to my DELL laptop then its causing my pc to restart immediately.
2. Showing that the folders are empty but there was at least 4 GB data in my flash drive in multiple folders.
I have more then one flash drive and not having such kind problems with them. I can’t try to format the drive because many important documents left there. I don’t want to loose any of that data. Please give me a solution and don’t tell me that it has completely damaged.
