Microsoft Security Essentials

• Check list for installing Microsoft Security Essentials
  http://answers.microsoft.com/en-us/protect/wiki/mse-protect_start/microsoft-security-essentials-installation/e6e18776-9571-42e9-8fc0-66717dde0e19
  
  
• Can I install Microsoft Security Essentials [or any other anti-virus/anti-spyware application] to clean up my already-infected computer?
  http://answers.microsoft.com/thread/87058857-d181-4019-a723-efd9a49d9275

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[1] Start | Control Panel | Programs and Features | View installed updates (in left-hand menu)
[2] No need to install Java if it's not already installed!