strange error after install vs2005(Version 8.0.50727.26 RTM.050727-2600)

When I uninstalled beta2 and installed the current version. Run following code will get a wrong result.

using System;
using System.Collections.Generic;
using System.Text;

namespace test
{
class Program
{
static void Main(string[] args)
{
string test = "\x3007AB";
if (test.StartsWith("AB")) //it return TRUE!!!
{
Console.WriteLine("Error");
}
else
Console.WriteLine("OK");
}
}
}

I reinstalled vs2005 using "repair" option. The error is still exists.I guess reinstall windows will solve the problem, but that cost too much time. Anybody can help?

[656 byte] By [BennyWang] at [2008-2-7]