SharePoint 2010 Upload

Already make the following changes and the General setting under SP Central Admin but doesn't help. Any idea ? Tks

1. <httpRuntime maxRequestLength="51200" /> with <httpRuntime executionTimeout="999999" maxRequestLength="51200" />
2. Already increased the connection Time-out

3. Remove unchange
    <security>
      <requestFiltering allowDoubleEscaping="true">
        <requestLimits maxAllowedContentLength="2147483647" />
      </requestFiltering>
    </security>

4. Under C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14\TEMPLATE\LAYOUTS

    <system.web>
      <httpRuntime maxRequestLength="2097151" />
    </system.web>

5. C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14\TEMPLATE\LAYOUTS

  <location path="upload.aspx">
    <system.web>
      <httpRuntime executionTimeout="999999" maxRequestLength="2097151" />
    </system.web>
  </location>

Tks