You only have 3.42GB of free space on the C drive, forget about Photoshop for the moment because you're going to run into issues on an OS level with only 3.42GB of free space, you really need to free up space on the C drive.
Photoshop uses space on the allocated drive/drives for temporary storage and this is what the scratch disk is, generally you can get away with 20GB of free space but it's recommended to have 100GB or even more depending on the kind of documents you work on, 500GB would be even better.
Just opening Photoshop without even opening a document requires over 5GB of scratch disk space.
Is it true that laptop only has 4 GB of RAM? (It's expandable to 16 GB, if these specs I'm finding are true.) That's pretty low. Photoshop loves RAM, as much as you can muster; if it can't use any available RAM, it's going to use your scratch disk.
As far as storage goes, move anything non-essential off the drive. (This includes, music, photos, documents, etc.) Get a removeable drive or use a NAS (network-attached-storage) solution.