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Are there more accounts in this computer? Try to log with another one. If not you must reset your password try with nt offline password reset http://pogostick.net/~pnh/ntpasswd/ you must boot from a cd or usb and follow the instructions in this page but first try to make a backup of your important data, you can use a cd with ubuntu or other livecd OS to copy all you need to an external usb disk. All this will work easily if don't have encrypted your system.
Normally what I do is this:
Turn on the computer, press F8 a few times
Click safe mode with command prompt.
Type in this into the black box: net user administrator /active:yes
Restart your computer
You will now see an administrator account
Click on it, windows will start normally.
Move over your documents from your old account
Once you have everything, delete your old user account
This is a simple fix that can be done in a few minutes or less. It is a problem with either an update from MSFT that had gone awry or an attack from a virus... Anyhow the steps to take are relatively simple just follow along.
1 - go to this site and it will walk you through step by step
switch the laptop on and then after the post messages appear and before windows starts press f8 repeatedly until the startup menu appears choose safe mode then log in as administrator. click start control panel > users > click manage user accounts then click create new user and create the account with administartor rights. Restart the laptop and log in to the new account you created then open computer up and right click on local disk c and click properties then click on tools click the button next to error checking saying check now. It will say windows cannot check a disk while it is in use and would you like to schedule a check on nxt restart or it will have a button saying schedule disk check, if its the latter click it. restart the pc and let it check the disk
after it has started windows try to log back in to your old account
if you cant log in to your old account you may be infected with a virus, scan your laptop.
U can try login in to the same user account in safe mode or try login in a different profile from there see if u can make any chages in the account of if the data there is intact. For further resolution u can visit this website.
I had one case like this before where there was another user on the machine who loaded the user profile hive in the registry and then forgot to unload it. Therefore when the user tried to log in, it gave them the message just like yours because it's "in use" by the registry. If there is another user on your machine, please ensure that this person unloaded the hive in the registry. And then try logging in again. Please let me know if the problem persists. If my suggestion works, please do rate me. Thanks.
What I would suggest is logging on in safe mode and trying to restore it to an earlier date using system restore. likely the profile is corrupted. By doing a restore back about 4 to 7 days , or before this started happening, will likely fix your issue. If not you will have to purchase the restore cd from toshiba or restoring it from a recovery partition if it has one.