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I was trying to install Windows SBS 2008 (64-bit) for trial, but I keeps receiving this error from Virtual Box everytime I tried to Start the system.

I enabled the Hardware VT from the BIOS (under Security menu) and restarted the computer - still the same error.

I disabled the Execute Bit from the BIOS - still the same error.

I untick Enable VT-x/AMD-V in VirtualBox Settings->System->Acceleration - it gave a different error.

I even downloaded the SecurAble to double-check if my virtualization & DEP are enabled, same with the 64-bit capacity - yes, I have virtualization & DEP enabled in my BIOS & I have 64-bit.

I also tried editing the XML file %systemdrive%\Users\%username%\.VirtualBox\Machines\<OS name>\<osname>.xml and type "false" for enabled of <HardwareVirtEx enabled="true" exclusive="false"/>

Shutting down the computer and leaving it off for 5 minutes fix the issue. I now have Windows SBS 2008 (64-bit) as the guest OS of my Vista (64-bit) parent OS.

When designing a webpage, my computer used to freeze. When I checked the Task Manager, the CPU Usage reached to 100% wherein 98% is used by iexplorer.exe. I have been testing one of the webpage in Internet Explorer 6, 7 & 8 and each one of theml made the CPU Usage reached to 100%. Using Firefox alone had no effect - meaning, it had its normal CPU Usage while testing the webpage.

I checked my CSS and tried to delete some of the codes until I finally saw this code which uses all of my CPU resources:

#content { height: expression(document.getElementById("content").offsetHeight); }

That is the code for IE6 to compensate its inability to interpret top:0; and bottom:0;

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We have a Vista server (Home Edition 32-bit), 3 XP clients and other 5 Vista clients joined together in a Workgroup. Almost twice a day, we have to restart the Vista server as the XP machine lost connection when trying to access the file and give the following errors:

• when opening My Network Places = Error: Workgroup is not accessible. You might not have permission to use this network resource. Network name is no longer available.
  
• when opening the shared/mapped folder = Error: %Share% is not accessible. You might not have permission to use this network resource. Contact the administrator of this server to find out if you have access permissions. Access Denied.

I Googled the error, and tried the following but none of them totally fixed the issue. Please note that when I refer to client computer - it refers to XP installed PC, and the server is the Vista installed PC.

• Enable Simple File Sharing from the client and server. Made the Guest account password blank on both server and client.
• Client & Server: Uninstall 3rd part Anti-virus & Firewall.
• Disable Computer Browser service in all of the computers, just left it enable at the server and 1 Vista client.
• Server: Added the username and password of all the XP computers to the server.
• Server: Changed LAN Manager Authentication Level to send LM and NTLM responses or LmCompatibilityLevel=1
• Server: KB928233 - Turn the DHCP Broadcast Flag Off
• Server: Enable restrictanonymous from the registry
• Client: Remove the KB885250 patch.
• Client: Scan for threadspy virus.
• Client: Enable/Install LLTD to all of the XP clients.
• Client: I added KeepConn equivalent to ffffffff in the Regedit
• Client: Enable NetBios.

The only fix that made the XP connection stable is by disabling SMB2 at the server. Please note, you have to disable SMB2 in all of the Vista clients to prevent having an error. Edit the registry at your own risk. Always back up the registry before making any changes. If you do not feel comfortable editing the registry, do not attempt these instructions.

1. Run "regedit" on Windows Server 2008 based computer.
2. Expand and locate the sub tree as follows.

HKLM\System\CurrentControlSet\Services\LanmanServer\Parameters

3. Add a new REG_DWORD key with the name of "Smb2" (without quotation mark)

Value name: Smb2
Value type: REG_DWORD
0 = disabled
1 = enabled

4. Set the value to 0 to disable SMB 2.0, or set it to 1 to re-enable SMB 2.0.
5. Reboot the server.

To read more about SMB, you can check this link http://www.petri.co.il/how-to-disable-smb-2-on-windows-vista-or-server-2008.htm