I have problems using anything newer than IE8. In IE8, add the IP's for your 3300's to your Trusted Sites and set the security level for them to "Low". That fixes a lot of issues. Also make sure Windows Firewall is either off or is set to allow incoming FTP (TCP on ports 20-21).
Also, if you have Windows 7 Professional or better, you can download Windows Virtual PC and XP Mode files from Microsoft and set up a virtual XP machine, and use that to back your systems up, it plays much nicer with older (release 9.0 and lower) 3300's.