I’m sure somebody will look to help you shortly but in the meantime I would suggest that you edit you post to remove the Windows key … don’t want it stolen.
Thanks For the tip. I've only had the PC since February so I don't want to do anything drastic but I'm going to buy a 1TB SOLIDIGM P44 PRO GEN 4 M.2 NVMe PCIe SSD (up to 7000MB/sR, 6500MB/sW) to repalce the 512GB PCS PCIe M.2 SSD (3300 MB/R, 2200 MB/W)
@Scott and @ubuysa - Many thanks for your comments. With all my programmes, including games, on my C drive I’ve got just under 30% usage of that drive so I’ll carry on doing as I do at present. If I start to approach 50% I’ll move a game or two to the D drive.