IFX0101 is Infineon Trusted Platform Module and provides a hardware anti tampering security chip.
In the Windows Device Driver section’s Hardware ID, below is used.
It seems from HP’s website’s NW8240 driver download page, there’s a download for Windows 2000.
Also, as described below, you cannot use Bitlocker from Vista or Windows 7 if you do not have the v1.2 TPM chip.
As written on the other post, it is listed in the device driver section as an Unknown Hardware and has the Hardware ID of ACPI\IFX0101. If you have this combination, your OS does not have the correct drivers installed for the TPM device or does not have any driver installed to utilize this.
To resolve this issue, you’ll have to install the TPM driver which is supposed to be supported by the vendor. However, as the Compaq NW8240 is an old machine from the XP age, HP only supports this machine up to Vista.
If is a brand name PC from some vendor, if its a Desktop PC or a notebook PC, there’s already a TPM chipset and an associated device driver already installed or ready for you to download from the vendor website. But, if you’re going to install any other OS that didn’t come with your machine there might not be a TPM driver ready for you.
As an example, the HP Compaq NW8240 is from Windows XP era but HP has support for TPM for Windows 2000, Windows XP (Home/Professional), Windows Vista (Home Basic/Business) 32-bit. And if HP supports it, there’s a TPM driver for the supporting OS.
If you take a look at the driver download page for HP Compaq NW8240, in addition to above, there’re driver download for Windows XP Media Center and Windows XP Tablet PC Edition but a TPM driver download is not available.
A mystery for why Media Center and Tablet editions doesn’t have the TPM drivers downloadable but its an XP machine, so the other XP editions’s TPM driver should work.
About versions for the Trusted Platform Module(TPM)
The current TPM version is 1.2 Revision 116.
If you upgrade Windows XP Pro which came with the HP Compaq NW8240 to Windows Vista or above and tried to use the Bitlocker program, you’ll be denied for the use. It is because the TPM chip that is installed in the NW8240 is an old v1.1 type. So, if you want to use the Bitlocker, you’ll need the v1.2 TPM chip.
You can still use the v1.1 and enable Bitlocker but you’ll need a USB stick. For more information about this, refer to below or search the web for more info.
Can I use BitLocker on a computer without a TPM version 1.2?
For the boredom for trying, if you try to enable Bitlocker with a v1.1 chip, you’ll get the following error.
The HP Compaq NW8240 has in its HP driver’s the Tpm driver listed from Windows 2000, but it does not mean that everything is supported for TPM related issues. As said above, the Bitlocker require the TPM chipset to be v1.2.