No, you can't uninstall Windows 8. Two things you can do:
1. Shrink the current partition, and install Windows 8 on a new one in a dual-boot configuration.
2. Make an image (with Acronis or Clonezilla) of your current setup on an external drive, so you can go back to that.
If I upgrade on top of my windows 7 laptop to windows 8.
Can uninstall later if I feel like. Or is the install final.
Samsung nprv-515 a01us 320gb hd 8gb ram.