I have following questions.
- Is it possible for spyware or any other software to install without user initiation and notification ?
- I have dual boot(windows 7 and 8), is it possible that any spyware(or virus) in one OS also works in another OS too ?
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Q1: Certainly. In fact it is now very common. A common vector now is from rogue adverts on web pages exploiting vulnerabilities in the browser or in Flash/Java plugins.
Even when malware is not cross platform, it is still possible for it to travel across OS's by changing files.