Solved Large amounts of space taken up on my C + D drives

System Volume Information contains your restore points. To delete all but the most recent restore point: How to remove all System Restore points except the most recent one - Microsoft Support

Ok, I will not touch that kind of folder/file. The easy answer is to get another external hard drive, transfer more stuff from my existing d: drive. and then expand my c: drive partition to give me more space for OS etc. That should solve my space problem. Thank you once again. Your advice is invaluable.