|The 10GB partition is most likely the recovery partition.|
Laptops usually came from the factory with only one operating system partition.
When partitioning a hard drive it is unusual to be able to end up with two identically sized partitions. My guess is that Linux is seeing a phantom partition.
There are many free file recovery programs available but most run under Windows. So, in your case being that you have a laptop you have a problem.
BTW, this is why backing up is recommended.
Do you have another computer running Windows available? If so, you could remove the laptop hard drive and connect it externally via USB to a working Windows computer. Then run one of the file recovery softwares available.
Do you have restore disks for the laptop available?