I did a recovery in my PC and now when I try ro install some programs this error apears:error #0x80070725 incompatible version of the RPC stub.
what is going on ?

Below are some links on support.microsoft.com, Im not sure which version of windows you are using and what software is giving you the error. But here are some possible fixes for you. Let me know if you need anymore help.
http://support.microsoft.com/default.aspx?scid=kb;en-us;318943

http://support.microsoft.com/default.aspx?scid=kb;en-us;321915

http://support.microsoft.com/search/default.aspx?Catalog=LCID%3D1033%26CDID%3DEN-US-KB%26PRODLISTSRC%3DON&Product=&KeywordType=any&Titles=false&numDays=&maxResults=25&withinResults=&Queryl=RPC+stub&Query=RPC+stub&QuerySource=gsfxSearch_Query