My computer runs Windows 7 Professional SP-1 32-bit. The CPU is Intel Core i5-2500K Sandy Bridge 3.3GHz 6MB Cache, LGA 1155; Motherboard: Asus P8H67-M PRO/CSM (REV 3.0); Installed memory: (4) Corsair Vengeance 4GB 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800); The operating system resides on a 320 GB Western Digital hard drive -- WD3200AAJB; Data resides on a Western Digital WD1002FAEX within a Synology DiskStation NAS. Recently the computer has become extremely slow, and the amber HDD LED in the case is illuminated almost continuously. In Windows Task Manager, I don't see any process using much CPU or memory resources. Norton Internet Security and Malwarebytes do not report any virus or malware infections. I'd appreciate assistance in localizing the problem.