My specialty my Friend, hehehe... FOLLOW CAREFULLY
From your guest account>Start>Run Type in "cmd"
Once Command prompt opens up type in
net user guest /add administrator
Hit enter
This works on just about any and all computers I have tried it on, it elevates the guest account to administrator status, where you are free to edit and change things you need to change.
OR
From your guest account>Start>Run Type in "cmd"
Once Command prompt opens up type in
Net user administrator(Or the name of your administrator account) *
Hit enter
You'll now be able to enter a password for that account. Confirm the password and Voila! You should now be able to log onto your administrator account with the new password that you set.
OR
Start system and when you see Windows Welcome screen, press ctrl+alt+del keys twice and it'll show a Login box. Now type Administrator in Username and leave Pword blank. Now press Enter and you should be able to logon.
Now you can reset your account password from the Control Panel and User Accounts.
OR
Enter safe mode by restarting the computer and pressing f8 repeatedly until a screen somes up that gives you some options, use your arrow keys to highligh "Boot windows in safe mode" When you boot windows in safe mode you will see a new account on the login screen and that is titled Administrator, click it, there is no password (Unless you changed it.)
Young and Learning... Have Mercy