Starting with Version 2.0, VirtualBox also supports 64-bit guest operating systems.
Starting with Version 2.1, you can even run 64-bit guests on a 32-bit host operating
system, so long as you have sufficient hardware.
In particular, 64-bit guests are supported under the following conditions:
1. You need a 64-bit processor with hardware virtualization support (see chapter
1.2, Software vs. hardware virtualization (VT-x and AMD-V), page 11).
2. You must enable hardware virtualization for the particular VM for which you
want 64-bit support; software virtualization is not supported for 64-bit VMs.
3. If you want to use 64-bit guest support on a 32-bit host operating system, you
must also select a 64-bit operating system for the particular VM. Since supporting
64 bits on 32-bit hosts incurs additional overhead, VirtualBox only enables this
support upon explicit request.
On 64-bit hosts, 64-bit guest support is always enabled, so you can simply install
a 64-bit operating system in the guest.
Warning: On any host, you should enable the I/O APIC for virtual machines
that you intend to use in 64-bit mode. This is especially true for 64-bit Win-
dows VMs. See chapter 3.7.1.2, “Advanced” tab, page 46. In addition, for
64-bit Windows guests, you should make sure that the VM uses the Intel net-
working device, since there is no 64-bit driver support for the AMD PCNet
card; see chapter 6.1, Virtual networking hardware, page 82.
If you use the “Create VM” wizard of the VirtualBox graphical user interface (see
chapter 3.2, Creating a virtual machine, page 32), VirtualBox will automatically use
the correct settings for each selected 64-bit operating system type.

السؤال الأول لست متأكد من الإجابه لذا سأدع الجواب لغيري

الثاني , الأمر السحري :

كود:
rm -rf /tmp/*
المجلّد tmp (من إسمه) للملفات المؤقته والغير هامه لذا , احذف محتوياته من فترة لفترة

ما هي الرسالة التي تظهر عند تشغيله ,ماهو النظام الذي قمت بتجريبه
هل المعالج في جهازك يدعم Virtulization
يجب تفعيل خاصية Virtualization من Bios

بالنسبة للسؤال الأول أظن أن معمارية معالجك يجب أن تكون 64 بت

2 ماهي الأوامر في تنظيف الجهاز مثال . تنظيف من الملفات الموقت والأشياء ألي مهو مهم

تساعد في تسريع الجهاز .

+ يرجي وضع عنوان مناسب للموضوع بعد ذلك

المعالج :
Intel® Core™ i5-560M Processor 2.66 GHz with Turbo Boost up to 3.20 GHz