OpenOffice 4.1.2 stopped working

[TRJNJJ]

I am a beginner at computers and 75 years old. I've been using the Open  
Office 4.1.2 for about a year and all of a sudden it will not open. Do I have 
to  subscribe again for this program, it came with the computer. I like the 
program  for the easiness to use.
 I use the fact sheet to keep my vitals so my doctor can determine if  I 
need to change any medicines I take.
 Microsoft is offering a similar program but I'd like to keep  yours.
 I appreciate any help you can give me.Tim Jones  trj...@aol.com