I had a separate partition made for Linux Mint which installed just fine and I had used for about a month (new linux user), while having Windows 7 dual-booted so I could play games on Steam. I decided to switch to Ubuntu, and I tried installing it the same way I installed Mint.
I put Ubuntu on a USB drive, booted with usb, installed from Ubuntu, clicked on Something Else (other then over windows), and picked the partition I made for Mint. I formatted it and used the ext4 filesystem and no swap space, the installation went just fine. At the end it told me to restart and when I did, not only did my Ubuntu Partition go missing, so did my D:\ Drive which had all of my steam games, some school files, and my System Image folder (unfortunately). This is my partitions viewed from Windows 7
What are my options
edit: Im willing to reset my laptop to factory if I have to, to fix it
edit2: I have an Asus K53-SV Laptop
edit3: I can see my drives again in gparted but how can I fix grub so I can run ubuntu
edit4: Grub doesn't seem to be installed when I look for it in the ubuntu software centre (keep in mind im a brand new linux user)