Usually this points to an incorrect bios setting or a low, dead BIOS battery.
The Dell 1525 service and documents are at http://www.dell.com/support/home/us/en/04/product-support/product/inspiron-1525/manuals
Page 12 of http://downloads.dell.com/manuals/all-products/esuprt_laptop/esuprt_inspiron_laptop/inspiron-1525_service%20manual_en-us.pdf shows the BIOS battery is the usual under one dollar part. If this was mine I'd measure that voltage and it under 3.0V it would be replaced. Then I would enter the BIOS to set date and time then save and exit (the manuals tell this.)
What is the way to remove the “Press F1 to continue” message when the laptop starts. I got its processor replaced. Since then I am getting this message. The machine is Dell 1525.