Windows XP issues a 'Delayed Write Failed' message when you perform file management tasks

Turn off Enable write caching on the disk:

1. Use My Computer or Windows Explorer to right-click your disk and press Properties.

2. Select the Hardware tab.

3. Select the disk and press the Properties button.

4. Select the Policies tab.

5. Clear the Enable write caching on the disk check box.

6. Press OK and OK.

7. Repeat steps 3 through 6 for each disk.


Another possible cause of this is your sql server is out of disk space because the db files on stored on the c drive.

Last possible reason you need to bump the maximum file size in your web.config on your Sharepoint server under inetpub directory. maxRequestLength property

I have seen this issue before on windows xp.