Getting Admin permission XP

This might have been addressed in the past but at this point I'm besides myself and need help.
I hane an old dell 600m laptop. I've been trying to change my permissions from guest to Admin. There is no admin available to ask for help. Please don't laugh. I found this laptop at the recycle center. If this can be solved ii have an. Internet connect problem as well. Thanks in advance to all the members here.
 
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