A fast fermentation doesn't hurt most wines at all. Some conditions just lead to a faster ferments than others. You may lose just a bit of aromatics from some fruity wines, but it certainly doesn't ruin it. Placement of your fermenter will affect the speed it goes at. To slow it down, move it to a cooler part of the house. If your floor is heated, move it off the floor, etc. Keep the wine/must in the desired fermentation range listed for the kit or if a country wine, keep it between 68 and 75 if possible.