Hi, oceania. Welcome to LandzDown Forum.
I'm not sure I have an answer for you but do have some questions, a couple comments and a suggestion. How will that do you? Questions
You have a brand new laptop with Windows XP? Are you dual-booting with Windows Vista on another drive? Did you uninstall Windows Vista and install Windows XP? Comments
HijackThis does not show everything and much is white-listed. As far as registry cleaners, I have seen where they do more damage than good, particularly a program that indicates a number of problems but wants cash upfront to make the repairs -- on a new computer.
The file is the audio driver for the Dell laptop. See http://www.file.net/process/stsystra.exe.html Suggestion
Based on Ed Bott's post, Update your Dell SigmaTel audio driver
, I suggest that you go to the Dell website to see if there is an Sigmatel driver package for your Dell system. Please read the entire article Ed posted and realize he was using Windows Vista at the time so you may not get the same mileage he did.
Please post back and let us know if you located the correct updated driver.