How do I contact my computer's system administrator?

I received a computer from someone so I don't have administrator rights. I don't know the name of the original administrator, so I can't contact him, but I want to change the administrator to my name. Does anyone know what the process is for this? Any steps would help. Thanks!
Answer:

Depending on your system OS you can get into preferences and set yourself up as a new or other administrator.

Robin at Yahoo! Answers Visit the source

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Other answers

Since U probably have 2 rid Ur hard drive of someone's unnecessary stuff anyway...Reformat using the system CD.

slvrfx24

There are some diagnostic CDs out there that will allow you to change the admin password. I'm thinking the name is something like Ultimate_Boot_CD or something. Or google lost admin password. Hope this helps...

TomS...

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