When I try to renew an IP address I get this message

C:\>ipconfig /renew

Windows IP Configuration

An error occurred while renewing interface Local Area Connection : The RPC server is unavailable.

How can I solve this problem?

After googling I found that is caused by a file named iKernel.exe is missing.
This problem can be solved by just copy back this execute file to the path.

Solution:
1. Copy a iKernel.exe file from any computer and then paste to below location
C:\Program Files\Common Files\InstallShield\Engine\6\Intel 32\
2. Reboot your computer.
3. Done.

The solution is boot into single-user mode from GRUB and then change the root password.

Below is the steps to reset root password.

1. Reboot your workstation, wait until the GRUB menu screen come out.
2. Select the desired kernel you want.
3. Press the ‘e‘ key to edit that entry.
4. Use the arrow keys to navigate to the kernel line
(for example: kernel /vmlinuz-2.6.x-x ro root=LABEL=/ rhgb quite)
5. Add the argument ‘single‘ to the end of the line and then press ENTER.
6. Press the ‘b‘ key to boot.
7. After booting, type ‘passwd‘ to change your root password.
8. The end, reboot your workstation and done.

Of cause, there are many others way to retrieve your root password.
The solution I give here is only one of the solutions.
Hope, my sharing can help you.

I am using Dell PowerEdge 1400SC.
When I boot the server after pluging in another two 256MB Memory into the mother board.
This message was display.

Amount of available memory limited to 256 MB!
Strike the F1 key to continue, F2 to run the setup utility.

After couple minutes searching on Google, I found the answer already.

This is due to “OS Install mode” is enabled.

The solution is

Press F2 enter to BIOS setting
Turn off “OS Install mode”
Save Changes and Exit

F-Secure (formerly Data Fellows) is an anti-virus and computer security software company based in Helsinki, Finland and founded in 1988.

The company has large branch offices in the USA and Japan, where some antivirus analysis and software development work is also being undertaken.

== Software x-files ==
Name: F-Secure Online Virus Scanner
Language: English
License: Free
Official Site: http://support.f-secure.com/ols/start.html
Requirements: Microsoft® Internet Explorer 5™ or later with ActiveX enabled.

Dr. Web is an Anti-virus product from Russia. Dr. Web Anti-virus was developed since 1992.
You can scan your computer for viruses and other malicious and unwanted programs by using Dr.Web Online Scanner.The files submitted for online scanning will be checked by the latest version of the Dr.Web Anti-virus and the hottest add-on to the Dr.Web virus database.Upon the scanning, the resulting scan report will be displayed.

Dr.Web Online Scanner can only tell you whether or not the file(s) submitted by you are infected. But scanning of files will not give you the answer whether your PC is infected or not.

== Software x-files ==
Name: Dr. Web Online Scanner
Language: English
License: Free
Official Site: http://www.drweb.com/online/

Handy utility to print or save a list of files located in any folder. Right-click any folder in Windows Explorer and select “PrintFolder” in the popup menu.

== Software X-Files ==

Name: PrintFolder
Version: 1.3
Language: English
License: Free
Size: 547KB
Support OS: Windows 98/2000/XP/2003/Vista
Official Website: http://no-nonsense-software.com/
Download: Download 1

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