virtualbox.org

Hello! I am trying Virtualbox for the first time. I am running a Windows 7 host (64 bit) and trying to install Linux guest on Virtualbox. I got an error( error code 0x80004005, Vbox hardening) and have tried all the suggestions on previous posts that I saw, but still, no show. Please, I would be grateful for help. Thanks.

You have something loaded that hacks DLLs. I'm going to guess that you installed a third party theme manager in your Win7 host.

See FAQ: Diagnosing VirtualBox Hardening Issues.

Thanks very much for that! But I don't have another theme manager - only windows'.
I use SmadAV Antivirus. Could it be that or what else, specifically please? Thanks for the food job u guys are doing!!

VirtualBox did not identify SmadAV specifically or I would have mentioned it. However the FAQ I linked you to already tells you to test the effect of disabling all third party AV.

There is no way for me to be more "specific" that I already have been. Only you know what software is installed on your PC. The FAQ will give guidance only.

Ok! I'll work around it. Thanks very much again!!

I think I have "done" it! I started it with Headless start, and now, it's running but showing "No bootable medium found! System halted." Meanwhile, the .iso file is already on it.
Any tips please? Thanks very much!

If you can reliably start headless or detachable, but cannot start normal, that probably means that your host video drivers aren't security-signed completely. Try a host video driver update.

The 'fatal' warning means that none of the media attached to the guest had a bootable OS. Check that the ISO is really a bootable CD image (downloads from Linux distros almost always are LiveCDs so they should be bootable, if the download is good). Also check that the ISO is really in the guest's CD drive, and that the guest's boot order has the optical drive before the hard disk.

If you continue to have issues not related to the hardening issue above, post other issues in a new topic. Forum rules request one issue per thread.

Ok! I'll see to that. Thanks.