Do you find the page loads slower than ever?
Game is lagging badly?
Try these: 
My Computer
Turn off System Restore: System
Properties>System Restore>Turn off System Restore for all
drives
Off Error Reporting: System
Properties>Advanced>Error Reporting>Disable Error
reporting
Optimise Visual Effect: System
Properties>Advanced>Performance Settings>Adjust for best
performance
Enhance Processor Power: System
Properties>Advanced>Performance Settings>Advanced>Click
all options for Programs.
Virtual Memory: System
Properties>Advanced>Performance
Settings>Advanced>Change>Initial = your RAM current,
Maximum = 2x your RAM current.
Off remote assistance: System
Properties>Remote>"untick" Allow Remote Assistance
invitations to be sent from this computer/Allow users to connect
remotely to this computer.
Disable Indexing: My Computer>$Drive$
Properties(Do it for all drives)>"untick" Allow Indexing Service
to index this disk for fast file searching
Registry (Type "regedit"
from Start>Run)
Boot Defragging:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Dfrg\BootOptimizerFunction\"Enable"\"Y"
IExplorer Fifth Zone (My Computer):
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet
Settings\Zones\0\"Flags"\"47"
Disable Prefetcher:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session
Manager\Memory
Management\PrefetchParameters\"EnablePrefetcher"\"0"
StartUp Programs:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Disable datetime impression:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Filesystem\"NtfsDisableLastAccessUpdate"\"1"
Faster Shutdown: HKEY CURRENT USER\Control
Panel\Desktop\"AutoEndTasks"\"1" &
"WaitToKillAppTimeout"\"1000" & "HungAppTimeout"\"1000"
Speed up IExplorer page display: DELETE
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\Current
Version\Explorer\RemoteComputer\NameSpace\"D6277990-4C6A-11CF-8D87-00AA0060F5BF}"
Group Policies (Type
"gpedit.msc" from Start>Run)
Unreserve bandwidth: Local Computer
Policy>Adminstrative Templates>Network>QoS Packet
Scheduler>"Limit reservable bandwidth">Enable>"0"
Customize desktop/start menu: Local Computer
Policy>User Configuration>Administrative Templates>Start
Menu and Taskbar/Desktop
Disable windows messenger: Local Computer
Policy>Adminstrative Templates/User Configuration>Windows
Component>Windows Messenger>Do not allow Windows Messenger to
be run/Do no automatically start Windows Messenger initially
Run
Unregistering zip folder dll: regsvr32 /u
zipfldr.dll
Boost Processing Power, ignore background process:
rundll32.exe advapi32.dll,ProcessIdleTasks
Windows Services (Type
services.msc from Start>Run)
Disable the services with respect to:
http://www.theeldergeek.com/services_guide.htm
Each PC setting is different from each other, the services you need
might be useless for him, so follow this guide.
Misc
-Check your harddrives for error at least once per month
-Defragment your harddrives at least once per month
-Scan your registry at least once per 3 month
-Scan for virus at least once per week
-Uninstall uncessary programs
-Disable unused devices
[This is recommended for Microsoft Windows XP User only]
