Access network path from within servlet

I'm trying to copy some files from a network path from within a servlet. I realize that I cannot use drive letter mappings as they are profile specific. Instead I'm trying to use the unc path. I'm getting the following error when I read the error inputstream from the process:
String cmd = "XCOPY \\SERVER\SHARE\File.DAT C:\FOLDER /Y"
Runtime rt = Runtime.getRuntime();
Process p = rt.exec(cmd);
p.waitFor(); //execute process and wait for it to finish
BufferedReader input = new BufferedReader(new InputStreamReader(p.getInputStream()));
BufferedReader error = new BufferedReader(new InputStreamReader(p.getErrorStream());0 File(s) copied
Invalid drive specification
Exit code: 4
It works from the command line, the problem I'm guessing is that Tomcat runs at as service under the SYSTEM account. What permissions should I put on the shared folder to allow this, or is it a path problem?
Any help would be appreciated.

Starting the Tomcat service under the Administrator account fixes the problem, is there any reason I shouldn't use the Administrator account for this?

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