PC is dying after a month in storage

As the title implies, I just took my gaming PC out of storage after about a month of me being out of town, and since booting it, it has slowed down insanely. Taking up to 3 minutes to open folders (if it opens them at all) I have already updated windows and all my drivers, defragged the SSD's. And still nothing. For context this PC ran games like RDR 2 on ultra with 160 FPS. Any pointers on what could be wrong would be appreciated.