windows preview 10 9879

will your programs work with windows preview build 9879 can I put both my pc the other one is windows 7 home will it cost can I get a discount for 2 pc

They may work, I dunno. Try them. Programs are free.

http://www.piriform.com/ccleaner/builds

http://www.piriform.com/defraggler/builds

http://www.piriform.com/recuva/builds

http://www.piriform.com/speccy/builds

(At least) Basic support for win10 is in ccleaner and speccy. Purchases made from the web (as opposed to authorized physical retailers) are per PC and per year. The free versions are not hobbled in their use (the pro softwares give a few additional features and priority direct support from the developers but many people's needs are fulfilled by the free versions)