Hi,
That is the generic error shown in the browser, it doesn't tell us much. Can you do the following?:
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Go to http://YourSite.URL/Admin/ServerLog.aspx
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Click the "Clear Log" button.
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Try to insert an image or flash, causing the error.
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Go back to http://YourSite.URL/Admin/ServerLog.aspx
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Copy the contents of the log and paste them in a reply here.
This does sound like a permissions problem if you are uploading the image using the WYSIWYG but to be sure, please get the log contents.
Thanks,
Joe D.