I have been wracking my brain for this one and neither MP3 download sites or lyric searches have helped. Here are the lyrics I can remember, as sung by a female artist:
You came in to my life when my world seemed so unbright
You walked in side my dreams, making my dreams now reality
Are my precious one, your my sunshine when its raining
Now that you know all these things, let me welcome you in my arms
Chorus
Oh happy days
Feel so good to be alive
Oh happy days
Now that I know I have have you by my side
Oh happy days
Kiss sweeter than wine (?)
Oh happy days