sse asm question

I was playing around with some asm and was wondering. Why is it that when i use sse to manipulate data in parallel that it seems to accumulate errors that i otherwise dont get with my output?

ok im sry but all the responses i have gotten are just terrible...
>>9
wtf are u talking about ... have i not said several time i am using sse. I did not say anything about the fpu. And why suggest a higher up language... i am talking asm(Assembly).

>>6
>>7
yes , i know about rounding errors... that is clearly not the source of the problem. If it was then both the scaler and the parallel would have the same output.

It clearly seems that i over estimated u guys... u dont seem to have any idea what i am talking about.