Can I ask who installed Windows on this computer and why a RAID set up has been done.
Regarding Speccy;
You have a few issues going on there but the one that requires immediate attention is addressed below;
Partition 1
Partition ID: Disk #0, Partition #1
Disk Letter: C:
File System: NTFS
Volume Serial Number: 107CCC08
Size: 475 GB
Used Space: 439 GB (92%)
Free Space: 36,1 GB (8%)
For Windows to be able to run efficiently and to be able to update you need to have between 20 and 25% of the partition or drive available on a HDD and an SSD between 10 and 15% as free storage space at all times, if you don`t you risk Windows becoming corrupt or not being able to update which puts you at risk of malware attack.
Data only storage devices should not be allowed to get any lower than 10% of free storage space of the full capacity of the drive/partition on the drive, this also to avoid data corruption.
Please note that storage devices can physically fail if the amount of free storage space is allowed to drop below the required 10 or 20/25% minimum.
Uninstall as many unused programs, games, videos and music files as you can and get yourself another means of backing up to, post back when you have between 20 and 25% free storage space on the C: drive/partition and we can go from there.
Just a fyi, Windows should always be installed on either its own drive or on a separate partition on a larger drive, this reduces the amount of free space that is required to be kept available + it makes creating a regular back up a whole lot easier.
A 256GB SSD or separate partition on a larger capacity drive should be the minimum capacity allowed for.
Windows will also boot up quicker on its own partition as it does not need to install drivers for any third party programs.
One of the first things that you need to get rid of is the awful AVG, it is a complete resource hog and something that you don't even need.
Windows 8, 8.1, 10 and 11 come with an improved Windows Defender, it offers the same real-time anti-virus/anti-malware protection as Microsoft Security Essentials. Windows Defender also shares the same malware signature definitions as Microsoft Security Essentials, and Forefront Endpoint Protection. Technically, Microsoft Security Essentials has not been renamed Windows Defender, or combined with it in Windows 8, 8.1, 10 and 11.
If any AV product that you have is a paid for version you should always make sure that you have a copy of the product key kept somewhere safe just in case you ever wish to reinstall it.
Please create a new system restore point first.
How to uninstall AVG
here
After AVG has been correctly uninstalled, restart, check to see if Windows Defender has auto enabled and allow it to update and carry out a full scan of your computer.
Once done, restart, free up the required space, post back with an update when you are ready.
You are welcome btw