If that doesnt work, you're maybe gonna need your original windows disk. Then, depending on your Windows version (xp / vista / 7) you gonna need to go to the control panel, then to add / remove programs (uninstall a program on 7 i think) and then click Add or Remove windows components which is on the left. Once you're there, go to Accessories and utilities, click on Details then point to Games, again click on Details. Click on Spider Solitaire and select it. Click OK till you come to main window. Click Next.
that should be about it. also in that add or remove windows components you can remove stuff you dont really use like msn messenger or whatever.