最近電腦有點頓!!!需要升級嗎???

我的基本配備如下:

Operating System
MS Windows 7 Ultimate 32-bit
CPU
Intel Core 2 Duo E8400 @ 3.00GHz 51 °C
Wolfdale 45nm Technology
RAM
4.00 GB Dual-Channel DDR2 @ 399MHz (5-5-5-18)
Motherboard
ASUSTeK Computer INC. P5QL-E (LGA775) 52 °C
Graphics
S243HL (1920x1080@59Hz)
NVIDIA GeForce 9800 GT (Microsoft Corporation - WDDM v1.1)
(ASUStek Computer Inc)
Hard Drives
977GB Western Digital WDC WD10EADS-22M2B0 ATA Device (SATA) 30 °C
Optical Drives
PIONEER DVD-RW DVR-111 ATA Device
Audio
High Definition Audio 裝置

用多久忘了 硬碟最近讀取的很厲害 重灌就OK了嗎??
還是需要再替換新的設備呢?? 請各位大大給個意見吧!!!