Error 3105 While Writing

When I am writing a numerous number of records to an sql 2000 db from a single "large" *.dbf I eventually get an error, error code 3105 from the ole
db provider for sql (Error Description: The requested properties cannot be supported), after about 400 or so records are written. I monitored
what commands the sql server is doing and this is where is gives me an error:

(previous command from sql monitor for reference)
declare @P1 int
set @P1=180150371 <-------- p1 gets incremented by one every consecutive time I write something to the db
declare @P2 int
set @P2=2 <-------------- same as all previous writes
declare @P3 int
set @P3=4 <-------------- same as all previous writes
declare @P4 int
set @P4=-1 <-------------- same as all previous writes
exec sp_cursoropen @P1 output, N'SELECT UUT_NUM,SEQ_RESULT, (etc...), @P2 output, @P3 output,
@P4 output
select @P1, @P2, @P3, @P4

(this is where the error is)
declare @P1 int
set @P1=0
declare @P2 int
set @P2=229378
declare @P3 int
set @P3=294916
declare @P4 int
set @P4=0
exec sp_cursoropen @P1 output, N'SELECT UUT_NUM,SEQ_RESULT,(etc...),@P2 output, @P3 output, @P4 output
select @P1, @P2, @P3, @P4

It appears as though the P1 counter is reset to 0 for some reason and the other variables are not assigned the same value as all previous
times the write command was executed.
Does anyone know why this occurs? and why this gives me an error?