Closed Unassigned: XP library(lsmeans) don't work [118]

Hello,
I use R-2.15.2 with an addin Excel (framework 4 vs 2010) and Rdotnet 1.5.5
On 7 OS my application run very well but with XP i can't charge some library like "lsmeans".
My paths and installs are OK for both OS
Any suggestion ?
Comments: Not reproducible; not enough information provided