Delete of steam.exe failed, Win32 Error 5 Access is denied

http://support.steampowered.com/cgi-bin/steampowered.cfg/php/enduser/std_adp.php?p_faqid=35

This error is caused by a lack of user permissions, having the Steam.exe file attributes set to "Read Only", or by another program interfering with Steam's installation process (if the Steam client application has been updated to a version which was not included with your Steam installer package, Steam will download a new copy of itself and then delete the old Steam.exe file unless another program interferes).

1. Check your Windows user permissions
   Please ensure that you are logged in as an administrator on the machine which you are using to install Steam.
2. Check file attributes
   1. Right-click on the Steam.exe file which was created after running the Steam Installer and select Properties
   2. Uncheck the Read-only checkbox if it is checked and click Apply before closing the window
   3. Try running the Steam.exe file once more
3. Check your security software's settings
   If you are running an antivirus program, firewall program, or any security product which may be interfering with the deletion and replacement of the Steam.exe file (some security software will check a file's information every time it is changed and block automatic replacement of files) please check your settings for the program and make sure that you are prompted to allow activities which may trigger the security software.
4. Disable any programs which interfere with Steam
   Please consult the topic linked below and make sure any programs on the list are either disabled or uninstalled: http://support.steampowered.com/cgi-bin/steampowered.cfg/php/enduser/std_adp.php?p_faqid=451
5. Remove Spyware, Adware, and Viruses
   If the issue persists it is possible that a virus, adware, or spyware may be interfering with the installation process. Please see the topic linked below for instructions to remove the offending program:

http://support.steampowered.com/cgi-bin/steampowered.cfg/php/enduser/std_adp.php?p_faqid=249