AVAST Internet Security 7.0 problem - Cannot copy files btw computers

I bought 3 computers license for Avast Intenet Security 2012 / 7.0. When I tried to copy files from the 1st computer to the 2nd computer (both have AIS 2012), the file transfer went well for one hour at high speed around 30-55 MB/Sec.

After an hour, the file transfer stopped to near standing still with only few KB/sec. or perhaps freeze. Both computers have Win_7 x86. When it has problem, I reinstall Win_7 x64 on the destination computer (my new Acer Laptop) and the symptom still persisted. After the symptom started, at the destination computer, I tried disabling AIS firewall, disabling the whole AIS, rebooting, etc. at the destination computer but it did not help. I tried copying file from the 3rd computer to the destination computer, it also freezed with the same symptom.

When I uninstall AIS 2012 from the destination computer (2nd), the file transfer/copy is working fast and back to normal. (The origin computer still has AIS.)

After I reinstall AIS on destination computer, the symptom comes back. Then I tried disabling AIS totally on both computers. Now the file transfer is working okay again.

What is wrong? Please help.

You should only transfer the license.avastlic file. That is around max 2mb.

What do you mean by “only transfer license.avastic file”?

I use license.avastic file to install AIS on both computer at the beginning. That went well.

After that, I tried to copy my chunk of data files (200+ GB) to my new computer. That was when I had problem.