Okay I've found the fix it was VSS making over 135+GB of unknown space on my HDD, I noticed I had this issue on another drive that I have lots of data on so I googled it and came up with a result. I used WinDirStat to find what the issue was and used this command, I've copy and pasted the post that helped me from another forum.
LKSnow, the situation you are experiencing may be related to your System Restore space allocation not having a maximum set value. I have included steps below on how to check this, and adjust it's options if necessary.
Click Start, and then type cmd in the Start Search box.
Right-click cmd in the Programs list, and then click Run as administrator. If you are prompted for an administrator password or confirmation, type your password or click Continue
At the command prompt, type the following command, and then press ENTER:
vssadmin list shadowstorage
This will list the following System Restore space allocation:
Used Shadow Copy Storage space
Allocated Shadow Copy Storage space
Maximum Shadow Copy Storage space
Review each, and if the used amount is too high (accounting for your "unknown" space usage), you should change the Maximum option to meet your needs. To change the Maximum space allotment, use the following command at the prompt:
vssadmin Resize ShadowStorage /For=C: /On=C: /MaxSize=[place a value higher then 300MB here]
(The above assumes this adjustment is to your C: drive, change it if this is not the case, 300MB might be too low, choose a comfortable option, maybe 2GB or higher)
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Resizing the storage association may cause shadow copies to disappear. If MaxSizeSpec is not specified, there no limit to the amount of space it may use. As certain shadow copies are deleted, the shadow copy storage space will then shrink. MaxSizeSpec must be 300MB or greater and accepts the following
suffixes: KB, MB, GB, TB, PB and EB. Also, B, K, M, G, T, P, and E are acceptable suffixes. If a suffix is not supplied, MaxSizeSpec is in bytes.
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