Multidimensional Scaling with pairwise Fst

I want to create a MDS plot with pairwise Fst values derived from a 
population genetics project.  My Fst values are in a tab-delimited file 
(lower triangle only) that I view with Excel.  When I use the cmdscale 
command I get the message:
Error in cmdscale(x) : Distances must be result of dist or a square 
matrix
In addition: Warning messages:
1: "^" not meaningful for factors in: Ops.factor(left, right)
2: "^" not meaningful for factors in: Ops.factor(left, right)
3: "^" not meaningful for factors in: Ops.factor(left, right)
4: "^" not meaningful for factors in: Ops.factor(left, right)

I transformed my values using the dist command, but the resulting plot 
is not right.

My file of Fst values are the estimates of distance that I want to 
directly use in the MDS analysis.  Looking for help in making my Fst 
file read in R as a distance matrix for this to work.
-Jeff DaCosta
dacostaj at unlv.nevada.edu