You said you were given two choices...safe mode and normal. You should have several options other than just normal. Which are you choosing? You should be selecting either safe mode or "last known good" as a first attempt. Now, have you recently installed something that might have caused this? Perhaps you can undo this in safe mode. A simple boot disk doesn't give such access. Maybe you could provide more details about what surrounded this mishap. That would help.
Win XP Pro SP3
Dell Dimension 8400
On starting computer I get blue screen that wants me to choose Normal or Safe mode etc and when select and click says have possible hardware or software problem and to uninstal new programs etc. Is there a boot disk that I could download that would help me boot?