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If a restart is not effective or you’re looking for a more permanent fix, move down to the next method below. Several users have reported that after they rebooted their computer, VirtualBox was able to open virtual machines without being interrupted by the “Virtual machine has terminated unexpectedly during startup with exit code 1 (0x1)” error. If you haven’t already done this, start simply by rebooting your machine. Since the methods below are ordered by efficiency and severity, follow them in the order that they are presented until you find a fix that successfully resolves the issue in your particular scenario. Below you have several fixes that other users in a similar situation have used to get the issue resolved. If you’re currently struggling to resolve this particular issue, one of the methods below will enable you to resolve the issue.
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So far, this issue is only confirmed to occur on Windows 7.
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The VirtualBox kernel driver is not installed (or is corrupted) – A couple of users have managed to get the issue resolved by reinstalling VirtualBox along with the VirtualBox kernel driver.
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