Can't install Minecraft Forge .JAR file in Windows 8
Answer posted by OP in comments
ahh hah, ok so a little more digging and i found out that for some odd reason, even though the game runs just fine, but she didnt have java installed, or at least didnt have the full program. i have since gone to the java website and installed the most up to date java program, and the tried the .jar file once again and it ran perfectly. so i guess first thing to do would be check your java version. i hope this helps anyone in a similar place