I also had a problem in our firm. By us was the Problem also with VSE 8.8, but during normal copy of zip files from C:\ to D:\ Drive (or from a network drive to c-drive). To copy other files was performance ok. Then I removed archive scanning option on the on-access default process policies, and then whats much better with copy of zip files. And also the security you alway have because: Ok yes the zip file is not checked (read/write) if you download it to your harddisk. But if you unzip this file (and this I think you do if you will work with this file), it's not longer a zip file and then it's again checked during or after unzip is happend (writing to harddisk).