I have just checked the Help section of Power Archiver and they say they include a self-extractor utility in the standard free download.
I won't be able to try it for a couple of days but am confident it will be as they say as my experience with Power Archiver has been 100%.
Also they add;"FOR MORE POWERFUL SFX ARCHIVES, DOWNLOAD POWERARCHIVER SFXMAKER --- FREE, POWERFUL TOOL FOR CREATING POWERFUL SFX ARCHIVES THAT EVEN SUPPORT SPANNED ARCHIVES AND THAT COMPLETELY INTEGRATES WITH POWERARCHIVER 2000. FOR MORE INFORMATIONS VISIT http://sfxmaker.cjb.net
As usual I have no connection with them except as a happy user (and the products are free anyway!).
Now I am off to http://sfxmaker.cjb.net
Happy Easter everyone.