HP error message: "No HP devices have been detected.  HP Solution Center will close now."
 
This error was caused by a virus, it modified file c:\windows\system32\tcpmon.ini
 
To restore the tcpmon.ini, contact Microsoft support and obtain the Vista version of tcpmon.ini 
 
To replace C:\Windows\WinSxS\x86_microsoft-windows-p..rtmonitor-tcpmonini_31bf3856ad364e35_6.0.6000.16386_none_d04210aeaa5e863a\tcpmon.ini
 

1.    Copy tcpmon.ini from another computer to this problematic computer. For this example, we copy to D:\temp\tcpmon.ini.

2.    At the elevated command prompt, type the following command, and then press ENTER:

Takeown /f C:\Windows\WinSxS\x86_microsoft-windows-p..rtmonitor-

tcpmonini_31bf3856ad364e35_6.0.6000.16386_none_d04210aeaa5e863a\tcpmon.ini

(I am assuming C is your system partition)

3.    Type the following command, and then press ENTER to grant administrators full access to the file:

Icacls C:\Windows\WinSxS\x86_microsoft-windows-p..rtmonitor-tcpmonini_31bf3856ad364e35_6.0.6000.16386_none_d04210aeaa5e863a\

tcpmon.ini /grant administrators:F

4.    Replace the file with a known good copy of the file:

Copy D:\temp\tcpmon.ini C:\Windows\WinSxS\x86_microsoft-windows-p..rtmonitor-tcpmonini_31bf3856ad364e35_6.0.6000.16386_none_d04210aeaa5e863a\tcpmon.ini

To replace c:\windows\system32\tcpmon.ini, copy the new one to D:\temp\tcpmon.ini.

2.  At the elevated command prompt, type the following command, and then press ENTER:

Takeown /f C:\Windows\system32\tcpmon.ini

(I am assuming C is your system partition)

3.    Type the following command, and then press ENTER to grant administrators full access to the file:

Icacls C:\Windows\system32\tcpmon.ini /grant administrators:F

4.    Replace the file with a known good copy of the file:

Copy D:\temp\tcpmon.ini C:\Windows\system32\tcpmon.ini

Also see: The All-in-One Cannot Be Located on the Network During Installation When a Firewall Is Used