I have a Dell system that had a perfectly.. no.. brilliantly calibrated (

) monitor. I recently reformatted the hard drive and lost the calibration settings. I now, for the life of me, cannot properly calibrate this monitor to anything even close to acceptable.
It is my intention to continue doing graphic design work on this system, but I cannot do so until this calibration issue is fixed. I thought I could do a reasonable job just by eye, but that obviously is not possible. Any idea what the best way to do this is?
If you need any more info - just ask.
Thanks!
Brandon