Is this an indication that someone is trying to hack into my server?

Recently I have noticed an increase in login errors. The most recent errors in my security log looks like the attached with a total of 190 occurrences by user name TEST and one by the GUEST user name. Does anyone have any info on anything like this? I'm sure it dosent matter but i'm running WinServ03.
Failed-Login-UserNameTEST.bmp
calvinlemonAsked:
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debuggerauCommented:
Yes, there is lots of info regarding this error, the most reliable source is Microsoft.

Basically, they error indicates that someone is trying to login to this computer with an invalid username and/or password.
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calvinlemonAuthor Commented:
Thanks, guess I got a bit excited there for a min. After looking further into my event viewer im convinced that they are hack attempts and not anyone in the office who forgot their un or pw. Thanks for your time, help, and reassurance.
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Windows Server 2003

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