If you’re hosting Windows SharePoint Services v3.0 on Windows Server 2008/IIS 7.0 then you’ll eventually find that you can’t upload files around the ~30MB mark. The symptoms are as follows:
Single File Upload via Document Library
Nothing happens, you get a 404 page.
Multiple File Upload via Document Library
It seems to upload the file but then after the page refreshes, the file is nowhere to be found.
Single or Multiple File Upload/Copy/Paste using open with Windows Explorer
The file begins uploading but then towards the end you get the following error:
Could not find this item
This is no longer located in C:\filepath. Verify the item’s location and try again.
You can retry all day long but it won’t work. The solution is here: KB 944981
The SharePoint Swiss Army Knife 
having same issue, any fix yet ? need help thx.
wow… i can’t believe you discovered this. i was going nuts.
thanks
I have done everything as instructed, but now i get a “500-internal server error. This is driving me crazy. Please help.
Hey, this article was great. I followed the steps in the KB article and it fixed our WSS problem. You rock! Thanks for the great help.
Thanks a lot henry, you saved me
Thanks, that saved my day !!!
Thanks a lot. This KB article works great!
Thanks! I was spending way too much time figuring this out:
Sharepoint can’t upload 30Mb file WebDav. 0, zero byte file using WebDav
still got the problem after done all steps…
thanks Nice KB
WOW … Thanks a lot for this info!!!! I thought I was going nuts or that there was something wrong with my Shraepoint deployment (was making me nervous)! I honestly regret having done the install on a Windows 2008 R2 box, given all the problems that I have come accross so far, specifically introducted by the Windows 2008 platform. GGggrrrr.
Thank you, just what I needed.