There are several after market fences available, most are $200+. If it's not in your budget, the one you have should work fine, you may just have to double check that it locks down squarely and if not adjust it until it does by bumping the rear side of the fence left or right. Measure off of the one of the miter slots to check that the distance is the same front and back when locked down. I grew up with one similar and you just made it a habit to set the distance to the blade from the fence, then measure what the distance is to one of the miter slots, then make sure the front and rear of the fence is that same distance before making a cut. If not, besides getting really bad saw marks, you can get a kickback or have your hand sucked into the path of the blade if not careful.
Follow Scott's advice and check the bearings and watch the videos. The one on table saw tuning is a good one especially.
One other note, when using a table saw, never stand behind directly behind the blade...always stand to the left of it. If your work gets wedged between the blade and fence, there is a good chance of a kickback, you don't want to be behind that piece.
To a small child, the perfect granddad is unafraid of big dogs and fierce storms but absolutely terrified of the word “boo.” – Robert Brault