Wednesday, November 14, 2012

HowTo: License a single VMware ESXi host


ESXi registration is free, although the steps to getting a license key are not necessarily straight-forward. You will need to register a free account with VMware in order to get a license key.

Get a license key

1. Log on to and register and account. The current link is:
2. Log in using your account
3. Go to vSphere download page. The current link for version 5.1 is:
4. Scroll down to "License Information" section

Now that you have your key, you will need to assign it to your ESXi host

Assign the key to the host

1. Log on to host using vSphere
2. Go to "Inventory"
3. Highlight the host's IP address
4. Go to "Configuration" tab
5. Click on "Licensed Features" under "Software" section
6. Click "Edit..." on the right hand side

7. Select "Assign a new license key to this host"
8. Click "Enter Key..."
9. Copy/paste your key here
10. Click "OK"
11. You should now see the word "Never" in the "Expires" section

Tuesday, November 13, 2012

QuickStart: System File Checker tool for Windows


The System File Checker tool (SFC) calculates a hash for each Windows system file, and compares it with the hash from the original system file. An un-modified version of all system files are kept in the Winsxs folder in Windows Vista and later. In Windows XP and earlier, you must use an OS CD to provide the SFC tool with an un-modified version of the system files. If desired, you can load a copy of the Windows XP CD onto the hard drive and point SFC to it using a registry key, but that is beyond the scope of this post.


I find this tool to be most useful after a malware infection. I always run it in this case just to make sure important Windows system files are intact. Of course, the only way to be completely sure you have a clean system after an infection is to re-install the OS. The SFC tool is also useful for cleaning up broken system files that have resulted from some kind of disk corruption.

These commands will work on all OSs, XP and newer.

Run a full verification & replacement scan

1. Open a command prompt
2. Enter:
sfc /scannow

Run a full verification scan

1. Open a command prompt
2. Enter:
sfc /verifyonly

Scan and replace a single file

1. Open a command prompt
2. Enter:
sfc /scanfile=c:\windows\system32\file.dll

Verify a single file without replacing it

1. Open a command prompt
2. Enter:
sfc /verifyfile=c:\windows\system32\file.dll

More information

See the following sites for more information on this tool and how to use it: