virtualbox.org

I had problem opening the Oracle Linux Hands on Labs image with VirtualBox on my Windows 7, It errors with message: Failed to create the VirtualBox COM object. Callee RC: E_INVALIDARG (0x80070057)

So I tried uninstalling virtual box on my Window 7 Professional. The uninstaller does not work, and it complained: "the specified account already exists. "
So I have to manually deleted all the virtual box folders and deleted all virtualbox related regedit entries, except for LEGACY_VBOXDRV and LEGACY_VBOXUSBMON, I'm not able to delete these two regedit enties as it errors.
After doing that, I restarted windows, and try to install VirtualBox-4.3.20-96997-Win again, now it complains:
"The older version of 4.3.20 cannot be removed, contact your technical support group."

So I'm stuck now. Can someone please advise?

Thanks!

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update: this issue has been resolved by restore to an earlier windows restore point.

me 2 T_T

and i have another problem that it have an bug form set the cpu , the cpu set 2 or 3 or 4 , running vm , is not 2 or 3 or 4 cpu in vm . T_T

I have the same problem, tried every thing but nothing work.

Failed to create the VirtualBox COM object. The application will now terminate. Callee RC: E_NOINTERFACE (0x80004002)

Log:
VirtualBox COM Server 4.2.28 r97679 win.x86 (Jan 16 2015 14:39:42) release log
00:00:00.015000 main Log opened 2015-01-23T06:22:17.980004900Z
00:00:00.015000 main OS Product: Windows 7
00:00:00.015000 main OS Release: 6.1.7601
00:00:00.015000 main OS Service Pack: 1
00:00:00.218000 main DMI Product Name: Studio 540
00:00:00.249000 main DMI Product Version:
00:00:00.249000 main Host RAM: 3327MB total, 1744MB available
00:00:00.249000 main Executable: C:\Program Files\Oracle\VirtualBox\VBoxSVC.exe
00:00:00.249000 main Process ID: 1192
00:00:00.249000 main Package type: WINDOWS_32BITS_GENERIC
00:00:00.390000 usbLibDevCfgDrGet: DeviceIoControl 2 fail winEr (31)
00:00:02.012000 VDInit finished
00:00:07.129000 Watcher ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={3b2f08eb-b810-4715-bee0-bb06b9880ad2} aComponent={VirtualBox} aText={The object is not ready}, preserve=false


Please help!.

Thank you