Do you wish to fix the problem in Access or Excel?
In Access you could do
DateValue("1/1/2003")+(WEEK_NUMBER*7)-7
or something along those line where WEEK_NUMBER is the value you are generating and 1/1/2003 is the first report date you wish to show
You could generate the 1st of the year date by doing
DateSerial(Year(Date()),1,1)
If you which to do the conversion in excel you can do a simular calculation
=B$3+(A4*7)-7
Where B3 contain the first date (1/1/2003) and A4 down contains the weeknumbers.
Hope this helps.
ebkid