Purchase a new hard drive, for example, SSD. Connect it to your PC and run MiniTool ShadowMaker or MiniTool Partition Wizard to clone the old disk to the new disk. Remove the existing hard drive and put the new hard drive back to the original place. Boot the PC from the new hard drive. To get more details on the disk upgrade, refer to this post - How to Upgrade to Larger Hard Drive Without Data Loss.