[Not sure how to phrase this. The serial number I posted: F819-AB02 is the "hexadecimal" version which calculates into 4162431746.

oooops!! you are right, I was on a different drive (U:\>)when I tried DIR on dos prompt. my bad....

when I try it on c:\ they are same numbers.

Thanks for ur help....

u still stand by the fact that this number could be changed huh?