SpinRite 5.0?runs forever !!

Question about times of spinrite run?

I have a clients dell dimension XPS D3000,pentium 2,about 3 yrs old,that stalled on scan disk at ?C;\PROGRA`~1\MICROS~2

When boot wont go to win.com says ?drive has developed bad sectors,run scandisk?

Itried booting from norton util emerg disk,but still stalled, so iv had SpinRite 5.0 running for 3 hrs,now it says estimated time remaing 9 hrs, just keeps extending time?

Its run now 4hrs now only at 24% complete !!