Step-by-step description :
1. Download CCleaner and disable unnecessary startup entries.
2. Disable unnecessary visual effects, only leave these checked:
Enable Aero Peek (If you want to use Aero Peek feature)
Enable transparent glass (If you want to use transparency in Windows)
Show thumbnails instead of icons (If you want to show thumbnails in Explorer)
Show window contents while dragging (If you want windows to show contents while moving them)
Smooth edges of screen fonts (If you want to show smooth fonts)
Use drop shadows for icon labels on the desktop (If you want to show shadows under desktop icon labels)
3. Disable unnecessary services such as:
Internet Connection Sharing (ICS)
Routing and Remote Access
Smart Card
Application Management
Bluetooth Support Service
BranchCache
Certificate Propagation
Distributed Link Tracking Client
Hyper-V Data Exchange Service
IP Helper
Microsoft iSCSI Initiator Service
Netlogon
Network Access Protection Agent
Offline Files
Parental Controls
Remote Procedure Call (RPC) Locator
Remote Registry
Smart Card Removal Policy
SNMP Trap
Storage Service
Windows Biometric Service
Windows Connect Now - Config Registrar
Windows Media Player Network Sharing Service **
Windows Search **