Getting help and advice from one of the many experts here at Microsoft Community does not cost anything.
Whenever you receive a phone number as an answer and feel uncertain whether it is from someone at Microsoft, don’t take the risk,
confirm the number is for official Microsoft Support.
April 14, 2014
Support for Windows XP has ended
Support and updates for Windows XP are no longer available. The Windows XP Community forum will continue to be available for discussion on Windows XP topics with other customers.
Find out how to stay protected.
If you don't want to install 7zip, you can monitor your local TEMP dir, such as c:\windows\users\<user>\AppData\Local\Temp\ and look for a just created 7z.....tmp dir just after you have started the installation and the files are extracted.
This dir. you can copy and save with another name , if a reinstallation of basecamp is needed. Just start the BCMAIN.msi.