Sy can stand for many meanings, if you have tried many passwords and none of them is correct, you can stop wasting of time and use a Windows 7 pasword recovery tool - SmartKey Windows Password Recovery. I have used it to recover my passwords and it worked. You can check out http://lnkd.in/URAwXy for more information.
Change your password~make it easy. If you cannot change your password, then I suggest you change your E-Mail provider. Did they ask you secret questions or did you give them an alternate E-Mail address? You can change your password if they can identify you in some other way. I was stupid-I wrote down the answers to my secret questions, then I lost the answers, and I did not provide an alternate E-Mail, so I am basically screwed. But I don't know your situation. I don't have Windows 7, and I don't understand how it works. But if I forgot my password, I would just change it.