How to Speed up PC/Computer

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4)Use add & remove program:-

Go to Start> Setting> control panel> Add & romove program.

Now from the list that you see here remove applications that you don't use frequently.

5)Remove Startup program:-

In Run Type "MSCONFIG"

Click the startup tab and uncheck all the program's except your anti virus. because all the other processes that starts at start up only consume Ram
NOTE:-in case some process is required then you can start them youself.

6)Stop unused process:-

In run Type "services.msc"

this window show a list of services that your os provides you but from this list there are many services that a normal user do not require therefor they not useful and should be stoped.
So to stop these process from starting at each startup right click the service that you want to stop and then click property in property set startup type to manual and stop the process. some of the process that can stop are listed below.(below list is for those programs which are not frequently used so stop it at your own risk)

• Alerter
  
• Automatic Updates
  
• ClipBook
  
• Indexing Service
• Messenger
• Net Logon
• NetMeeting Remote Desktop Sharing
• Protected Storage
• Remote Desktop Help Session Manager
• Remote Registry
• Telnet
• Terminal Services

The above list is for disabling some of the unused services of ms windows
NOTE:- an advanced user can set these according to its need.


7)Turn off graphics:-

Right click destop then goto property here change theme to Windows classic.

Incase your computer is working very slow then you should turn graphics off by changing you theme to windows classic.

NOTE:-
1) In case you computer is working very slowly then start the memory.vbe(change extension from txt to vbe) file

creating memory.vbe file.

• start Notepad
• in here type MYSTRING=(80000000)
• save it with any name but the extension should be vbe at desktop
  
• now whenever you computer is getting very slow start this file.

2) For more information click here

what is svchost.exe?

Introduction:-
Svchost.exe is a generic host process name for services that run from dynamic-link libraries (DLLs) in windows system.
During startup system create multiple instances of svchost.exe with each instance having some specific process that is defined in registry.
NOTE:- That's why you see many program named svchost.exe in task manager.

Q) where is it present?
Ans) it is present in the windir/system32 directory. As it is difficult for us to see which services are running in background or are contained by svchost.exe therefore there is a command to see all the process inside it.

tasklist /svc /fi "imagename eq svchost.exe"

here,

• tasklist: it is used to display the program under task manager
  arguments:-
  
  • svc: this argument is used to see services running behind the process.
  • fi: this argument indicate which of the program you want to select. with the name inside the double quote and also "imagename eq" ahead to file name.
    

Q) How To change Process in svchost?
Ans) The information of process to be start at startup is stored at HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SvcHost.
now u can change the process to be run at startup from there.
NOTE:-

1. Change registry at your own risk.
2. kill a process using command prompt:-
   
   • press start.
   • then go to run.
   • type there cmd and hit enter
   • then type taskkill /IM "process name"
   • hit enter.
     

For more detail go here