replace in java String

I have a String in the form of

<EMBED src='C:\Documents and Settings\dmadmin\Docu\Viewed\0906985f8000197c.pdf' height='490' width='1000'/>

In this String, I want to replace "C:\Documents and Settings\dmadmin" with "C:" so that the resultant Sting is
"<EMBED src='C:\Docu\Viewed\0906985f8000197c.pdf' height='490' width='1000'/>"

I am doing something like this

String dataString=sess.getAttribute("myEmbedString").toString(); //gets the comlete String
dataString = dataString.replaceAll("C:\\Documents and Settings\\dmadmin","C:");

But the value is not getting replaced. Please tell me how to sovle this issue.

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