Password re-configured itself?

I recently downloaded and installed Windows 7 Professional from the MSDA Alliance website as a student in my college.

I installed the OS with no issues, and decided to put a password in. I know what it is an put a hint in for kicks.

Now, when I go to put the password in on restart, it never accepts it. I have tried every combination for the last hour and I'm stressed out about it. I do not have a password disk, and I don't have a free CD burner, since the locked pc is the one with the burner.

Is there any way that I can get into my Windows 7 to alter the password at all? Via USB I ccan do via the boot menu.

I really want to get back into my new OS, just got it today.

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