BUG FOUNDED IN BIOS UPDATE A10 for inspiron 5458/5558/5758

Thank you for posting.  

Did you notice this problem using any other utilities, VMware etc.?

I did take the liberty on searching for "How to fix Virtualbox only showing 32bit option?" and found several hits.  

Superuser

Techfixes.net

Did you install VirtualBox and you were trying to install 64-bit guest OS but there was only option to 32-bit? You can probably fix this issue fast and easy.

If VirtualBox is showing only 32-bit options in the list, make sure that these apply for your computer:

1. Host OS is 64-bit
2. Intel Virtualization Technology and VT-d are enabled in the BIOS
3. If using Windows check that Hyper-V is disabled
4. (optional) Check that you have newest version here

TB

1.Host is 64-bit

2.Intel Virtualization Technology and VT-d Enabled

3.the os is windows 7 so i didnt have Hyper-V

4.this is the lastest update of VirtualBox

i dont know very much virtual machine apps nor than Vmware or Virtualbox ididnt try pralles

Yeah I think Vmware and Virtual Box are two of the best known VM applications.  Did you try Vmware and did it have the same problem as Virtual Box?  I looked and I haven't seen any Dell documentation that bios revision A10 can cause this type of problem.  So I am checking to see if this is only a problem with Vitual Box or with all VM applications.  

TB

i try scureable to check the system has the 64bit virtual hardware but i will try to downgrade to a09 and check

I Downgraded but 

its wired 

and after post the system flash 2 times mean goes to black and come with gray like any black turning screen but i couldnt find anything