My Dell computer system GD6DHF1 is locked by a password my girlfriend can't remember

The expresss service code is 35625284461 need password for access ive tried everything please help its a dell inspiron running windows vista 32
 
Is this a BIOS password? If so, try removing the CMOS battery for a minute and putting it back in (if you're comfortable doing this procedure)

There also might be a jumper on the motherboard that is labeled PWD, or similar, that you can use to reset a BIOS password (if applicable)
 
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