[R] Can not load msm package

[John Sorkin]

windows XP    
R 2.6.0
I have tried to install the msm package several times. Each time the  installation appears to work. I then go to PACKAGES->LOAD PACKAGE but the msm package does not appear in the SELECT ONE dialog box. Can someone suggest how I can get msm to run on my system?
Thanks,
John

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