IMPORTANT!! If you are reading this now, make sure you do not access the drive anymore!! Remove the drive from your 1525, put it in an anti-static bag if possible, and the continue reading the rest of this answer.
Okay, no worries - this has happened to many people before. However, you need to be mentally prepared that there is a chance you will not be able to get your data back, and also, it will probably take awhile to see what can be recovered.
Have you removed the hard disk? Great - now put it in a USB enclosure. This hard disk is now a USB drive.
Find another PC terminal, don't plug in the hard drive yet. In fact, one of the cardinal rules now is DO NOT ACCESS THE HARD DISK UNLESS NECESSARY!
Go get a recovery software - I recommend GetDataBack from Runtime Software. Install the software.
Plug in the hard disk to the USB port, and run the software. Follow the instructions to scan that particular hard disk. It will take awhile, but be patient. See what can be recovered. If you are satisfied with what can be recovered, purchase the software and start recovery.
There are NO legally free recovery software - it is an expensive process and the software is complicated. Respect the programmers and the data experts.