Microsoft sources
Microsoft ended support for Windows XP on April 8, 2014
Windows XP - Service Pack 3
KNOWLEDGE BASE ARTICLE HOME
Network Level Authentication (NLA) ENABLE - KB951608
RDC 7.0 FOR XP - KB969084
Non-Microsoft sources
STEP 1: Install SP3 (KB936929) Download here
STEP 2: Turn on CredSSP (KB951608) Download here
STEP 3: Download RDC 7.0 Client (KB969084) Download here