note: this is for winning a game of classic or "Klondike" solitaire
Calex dEUS has a good point in that the "H" key will help you if you are stuck on a move however one key thing to make sure you do is change the games settings so you only flip 1 card instead of 3 from the draw pile, this will save you many more "no moves left" games ending because you will have the full draw pile at your disposal.
They have kind of burred settings in Windows 8 and took me a while to find. when you are on the games home page drag your mouse to the top right corner of the screen to bring up the menu thing. then select the settings icon (cog), from there you should see "Game Options" select that and change card draw from 3 and put it on 1 card draw. took me one game of single card draw vs the 5 that ended with 3 card draw blocking me every time. hope this helps, If I am off with something please let me know.U2NUMB
notes that the settings may be layed out a little differently in Windows 8 (RT) if someone using a surface tablet and can find the setting let me know.
either way you might have to actually be IN a current game for the option to show up. so load a game and try and access the settings after the game has dealt the cards. this may make you re deal the cards but you should be able to win a game pretty easily in 2-3 games max