Please try the following step:
Add Uploader httpModule to web.config's httpModules list.
To allow CuteEditor to upload big files, you need to add Uploader HttpModule to your application.
IIS 5.0, 6.0 and IIS 7.0 Classic mode
<configuration>
<system.web>
<httpModules>
<add name="CuteEditor.UploadModule" type="CuteEditor.UploadModule,CuteEditor"/>
</httpModules>
</system.web>
</configuration>
IIS 7.0 Integrated mode
<configuration>
<system.webServer>
<modules>
<add name="CuteEditor.UploadModule" type="CuteEditor.UploadModule,CuteEditor"/>
</modules>
</system.webServer>
</configuration>
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asp wysiwyg html editor: http://cutesoft.net/ASP
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