First of all I'll say I bought Skyrim and Dawnguard and I installed from steam. I don't have any mods installed (nor I have the idea if I should be running a mod or a particular manual patch) and my pc meets all the requirements. I've played Skyrim without problems but since Dawnguard I've had some problems and I hope you can answer and tell me if they are fixable.
1-After completing Dawnguard quest my character became bugged, he doesn't run out of stamina and he doesn't get hit.
2-Can't turn into werewolf, when I do so nothing happens and when I try again it says I can use the power only once a day. This one is one that really bothers me since I bought this game to try out perks of werewolf so you make perks for vampire and werewolf but both are actually bugged (werewolf I'm sure, idk if vampire as well but I read so), is like selling a soda and giving and empty bottle and then saying "but you got the bottle". I've read what others said but I can't understand if there's a solution to this.
My question is if these bugs can be solved by means of patchs or console or I lost my save?
I'm a new player, please let me know if there is something I should have done like manual patch or some thing I should know. Also please try to avoid abreviations, if you use them put the full name by the side and if you have solutions that require downloading mods or patches please be kind and link the source.