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how to enable system acceleration tab in virtualbox? Here is a screenshot showing that system acceleration tab in virtualbox is disabled and not clickable! i am running windows 7 pc. my computer support SLAT and EPT here is a screenshot: any idea on how to enable system acceleration tab in virtualbox?

If you have enabled hardware virtualization in the PCs bios then something must be using it. Is XP mode installed?

Post the guests log file (as an attachment)
See Online Users Manual for the location of the file.

Make sure the VM is shut down (not just suspended) if you want to access critical settings.