Kapersky Internet Security locked my computer?

[Plasma]

I downloaded the free trial of Kapersky Internet Security 2010 from the official Kapersky website, and yesterday after updating it locked my computer with a password (For example: I couldn't go into my computer, internet, or even close Kapersky without a Kapersky password bar popping up). What I had to eventually do was restart and run safe mode to delete it. Any ideas on what might of caused this.

[Harvey]

What was the address of the site you downloaded it from?

[DiCE]

Wow that is crazy, Yeah what is the site you downloaded from?

[Julie]

If you didn't download it from this website: http://www.kaspersky.com/en/
It's probably backdoored..

[Infinity∞]

How to get into Windows.

If you still haven't "unlocked" your computer press "Control-Alt-Delete" on the normal Windows login screen and a Username and Password Field should come up.
Type Admin in the Username field and leave the password field BLANK.[/b] You should be able to get in.

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How to get into your locked out account

Press Start>Run and type "mmc" without the quotations.
Start the Local Users and Groups snap-in.
Under Console Root, expand "Local Users and Groups", and then click Users.
In the right pane, right-click whatever is locked out, and then click Set Password.
Click Proceed in the message box that appears.
Type and confirm the new password in the appropriate boxes, and then click OK.