I don't think any of these suggestions were in one of the links, but I may have missed it.
Do you know what created the folder?
Can you open the folder and delete individual files?
Safe mode or the Administrative command prompt hasn't worked? Possibly booting to a recovery CD or install DVD (or from boot using F8) and using the Command Prompt from there.
Have you tried moving or even copying the folder to another location?
Have you tried Shift+Del to bypass the recycle bin?
Have you tried right clicking the folder and selecting "restore previous"?
Have you tried restoring your system back before the problematic crash?
I will assume you already have the best information for the delete problem from the error message. But Event Viewer has logs, on in the Windows Logs-Security, which is supposed to track failed delete attempts of secure resources. This seems to be a corruption problem, so it may not show up there, but you might check to see if any additional information is available