can't open files

Hello ... PLEASE help URGENTLY ... I have issues opening old files (created in January 2011) although I am still using the version X4 in which these files were created. 
 (msg: "Corel Draw has stopped working" ... "close program"). I have re-installed the program from my original Corel cd and have also updated with patches Corel-X4-service-pack-2-CGSX4SP2 and Corel-XP4_patch1_CGSX4SP1. I have also tried the 'import' option. Unfortunately I cannot currently afford to buy the latest CorelDraw version. Thank you. Tina