elapsed time

I have a program that uses the following code fragment:

public static string scan;

DateTime t1 = DateTime.Now;

//some processing...

TimeSpan span = DateTime.Now - t1;
scan = span.TotalMilliseconds.ToString();

The problem is that the time seems to have a resolution of 203 milliseconds. I get either 203 or 406 MS. I thought that Windows 2k or XP have a 10 MS tick size. The old DOS timer has a 55 ms tick. Where does the 203 MS come from? How can I make this better? 10 MS resolution would be fine.
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