When you force update, the launcher.exe will go to www.minecraft.net and download the latest files for you, thus making a folder. If it doesn't work, try running the program in "Run as Administrator" authority, you could have a folder protection enabled. However, this should never happen because it should make a folder, so when you start up minecraft and log in, is there any error message that pops up (or anything at that matter)?
Yes, i entered it correctly, and it says Login failed, Try again or PLay offline?
Try again, and keep on trying again. This also happens to me from time to time. Eventually after the third or fourth time, it should log in. If not then you might need to open your firewall to allow minecraft through.