OK, where to start...
Your pinot grigio may or may not be good anymore because of the way it was stored. Refrigerators keep wine too cold, and at a low humidity. First of all, remove the bottle from the fridge and look at how much has evaporated from the bottle (where does the wine fill to in the bottle?) It probably is lower than a bottle you might purchase today. That is called ullage, with the *u* being a short vowel sound.
One way of knowing that the wine is not bad is to uncork it. Look at the cork. If there is a liquid line that goes all the way to the outside of the cork, the bottle has been *corked.* This means that air got into the bottle and forced wine out. The wine will not hurt you, if you drink it, it will just taste like old socks. It will smell bad, too.
When wine ages, you definitely want to do it in the bottle. Once wine is exposed to air, it starts to break down and lose the qualities that make it wonderful to those who like it. I'm not saying that you can't open a bottle and put a cork in it to save the rest for tomorrow, or even this weekend, but you shouldn't keep opened wine for a long time and expect it to be as good as when it was first opened. The exception to this are some very old wines that need time to breath. A bottle from the mid-90's is not going to fall into that category.
Also, whites break down faster than their white counterparts. You can cellar a red longer than a white. The cellarability of the reds has alot to do with the way it was made, the amount of tannins in the wine and other characteristics.
So, in summary, your bottle that was stored in the refrigerator would probably not stand up in a blind tasting at this point.