If you dual boot Windows and Qubes, it’s possible that a Windows virus could modify your Qubes /boot partition and infect Qubes. A way around this is storing the /boot partition on a removable drive which you never plug in while Windows is running or starting, but this doesn’t prevent all possible attacks. Windows viruses could for example compromise the firmware of various components or the mobo. In Qubes, Windows is run sandboxed and doesn’t interact directly with hardware unless you specifically allow it.
Running Windows 7 as your daily work OS is risky, since its security support has ended and extended support is obtained from possibly dubious third-party sources (unless you’re willing to pay Microsoft hundreds of dollars per year). Windows 10 is more secure against typical hacking attacks, but in other ways it can be considered compromised by design. (I personally prefer 7 to 10 even with security issues).
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