a) did you actually format the HD when you reinstalled? this may be a good idea..
b) i dont know about this...ive never actually used it..if im wrong im sure some pro will come and help you: go to start, run, type msconfig and click ok. click the 'boot.ini' tab at the top...have a look around
erm... im sure the guys here know what i mean..theyl tell you what to do properly..
and no, im not responsible for what you do in msconfig 'looking around'