Vista - Network file copy progress indication problem

I have an odd situation on network copying from my Vista X64 Ultimate PC to a Windows XP Pro PC.

I suspect it is something I have altered in the settings/registry whilst I was trying to overcome network copy problems. I am using Directory Opus 9.1 as my file explorer but I don't think this is the problem.

When I copy a large file (say 1.0GB) then the copy progress bar quickly goes to 100% and then remains at 100% for a period of time before completing. If I look in the Performance tab of the Task Manager I can see memory use quickly increase by 1.0GB and then slowly start to reduce. The peak is achieved at about the same same as the 100% is shown and the progress bar remains stuck at 100% whilst the memory reduces (presumably as the file is copied over the network). I suspect I must have set a cache figure at 1.0GB because if I copy a larger file then the memory increases and then flat lines for a period and then start reducing. In this case the progress bar will speed up to say 60% and then track slowly to 100% and then get stuck whilst the memory reduces.

I am up-to-date will all MS Updates.

I would be grateful as to any pointers as to what setting I can change to get the behaviour back to normal.

This happens using plain-ol'-Explorer too, right?

What about if you boot the Vista box to "Safe Mode + net" and try the copy from there? Same symptom?

Thanks for the suggestions

I uninstalled Directory Opus and rebooted into "Safe Mode + net" and the problem disappeared - a nice straight line on the memory usage whilst the copy was in progress + 100% reached when copy was complete.
I then rebooted back into normal mode and repeated the test. Again it all worked as it should.
I then re-installed Directory Opus and the problem is back
So despite my having said "I am using Directory Opus 9.1 as my file explorer but I don't think this is the problem." it looks like I was wrong

The only setting I can find in DOPus that refers to buffer size is under the 'File Operations' node in 'Settings | Preferences...' - it is set to 64K.

I'll post the same question on the DOPus forums to see if this has been seen before.

Again, many thanks for your help

OK - Looks like this is a problem with my anti-virus program 'f-secure 2009' and its interaction with 'Directory Opus 9'. If I disable f-secure (having disconnected from the internet) then it works as Windows Explorer i.e. when it gets to 100% progress the file copy completes. I spoke to f-secure who say this ia an attribute of their program and there is no way round it other than disabling the anti-virus (either unload it or turn off real-time scanning)
So at least I know what is causing the problem - Maybe it's time to try out some other anti-virus programs

Being an anti-virus driver is a complex and thankless task

Still, you'd think it would be more sophisticated than allocating a huge buffer to copy the entire file into temporarily (so it can be inspected for nasties). Most AV filter drivers work by inspecting each relatively small chunk of file as it flies past (64KB or less if you're talking to XP using its older SMB v1 protocol), so the memory overhead would not be as obviously peaky.

Out of curiosity, is this causing you any problems other than the aesthetic unpleasantness and the loss of a meaningful progress indicator?

Difficult to say. I have been having problems copying large files to my other PC which I had finally put down to hardware offloading in the network adapter. (see my reply to forum post - http://www.vistax64.com/network-inte...-transfer.html).
Since I made those changes (touch wood) it seems to be OK. Of course this anti-virus problem might not have been helping.

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