Wanted to install ubuntu but now it won't let me launch windows 8 anymore

Can you boot into Ubuntu?
If yes, open a terminal window and execute the command

sudo fdisk -l

You will be asked to enter your password as confirmation for an administrative action, and you will not see anything when entering your password (no echo, not even '*' placeholders).

Please copy/paste the output of that command into this question document that we can verify the result.

Hello, thanks for the reply :)

I am able to boot ubuntu yes, I'm currently only using the "try ubuntu without installing".
When I executed the command in the terminal it didn't ask for a password or anything like that but I got this:

ubuntu@ubuntu:~$ sudo fdisk -l

WARNING: GPT (GUID Partition Table) detected on '/dev/sda'! The util fdisk doesn't support GPT. Use GNU Parted.

Disk /dev/sda: 128.0 GB, 128035676160 bytes
256 heads, 63 sectors/track, 15505 cylinders, total 250069680 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x6ca6c244

   Device Boot Start End Blocks Id System
/dev/sda1 1 4294967295 2147483647+ ee GPT

WARNING: GPT (GUID Partition Table) detected on '/dev/sdb'! The util fdisk doesn't support GPT. Use GNU Parted.

Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes
256 heads, 63 sectors/track, 121126 cylinders, total 1953525168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x6ca6c25b

   Device Boot Start End Blocks Id System
/dev/sdb1 1 4294967295 2147483647+ ee GPT
Partition 1 does not start on physical sector boundary.

Disk /dev/sdc: 63.2 GB, 63182995456 bytes
255 heads, 63 sectors/track, 7681 cylinders, total 123404288 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xc3072e18

   Device Boot Start End Blocks Id System
/dev/sdc1 * 32 123404287 61702128 c W95 FAT32 (LBA)

You may need to go back into bios and re-enable the UEFI to get windows to boot. Once in Windows, go to Admin Tools, Computer Management, then select the Disk Management tool. Shrink your partition to a size you would like for Ubuntu. For me, I have set mine to be 100 gigs. This will create a new partition and it will show as unalocated space. No need to format. Just reboot and this time you should get an option to install along side Windows 8.

Also, I believe I have mine set to legacy support in bios with no secure boot and I am able to boot both windows 8.1 and ubuntu. It's odd though, as grub does not immediately come up for me. When I want to boot into Ubuntu, I have to press F12, that first attempts a network boot and then when that fails grub comes up and I can boot ubuntu.

Do you mind explaining how I can go into bios when all I get when I start my computer is black screen with some codes, only way I can launch ubuntu is by having my usb pen in the computer? I'm very bad at this kind of stuff :c

Oh man, I finally fixed it.
It was F2 that got me to the bios, thank you for the help! '^'