New error in FSX ???

Hello to all SIMVIATION fans.. I installed FSX in a hard disk of 500 gb and not in the OS disk..Recently flying with FSAirlines and then using only in FSX as try out and in any craft, to any airport, any level or speed I have this problem and have no clue or information or whatever about it..FSX or the PC dosent give me any information or data error...I dont have activated ....All failures and all weather is normal, graphics set in custom because I lost my GF9800 gtx 512gb so Im using a Gf520..Only have my base airport (SVMI) activated in scenery addons......What happens is that I loose:::.GPS, AP, FD, ATC, HGD, ILS, VOR, ADF, ALT ..., I can use athr and fly and land the plane but all the rest is dead. No information or pop up error. It can appear on climb, level out mid flight or descent....with full fuel or almost empty...ts ramdom,,,,The FSX IS original and all three codes were activates.....CD1, CD2 and ACCELERATION....I already asked my fellow captains in TCA Venezuela and nobody knows the problem...I would appreciate any information...thanks in advance.... Happy landings.... 
