I've never had any trouble, under XP or any other OS (95, 98, 2K, MCE, or Vista). CuteFTP is a great program, user-friendly for newbies but lots of features for those who want control. I've used the Pro version for years, with nary a machine freeze (such as the other reviewer mentions).

I use FTP as part of my trade as a web developer/manager. I have used several packages over the years including several versions of CuteFTP [when it was free, too - the good old days of the Interweb!]. Last fall it was time to get a new computer, and that meant Windows XP Pro for me. To go along with it I upgraded several software apps that were getting long in the tooth...

I am not sure if CuteFTP Pro 6 is known to be unstable after the user applies the last round of major Windows XP Pro patches - but that was my experience. I keep Windows updated religously and in the first three months of this year CuteFTP was wildly unstable. I uninstalled and reinstalled multiple times and still it was just unreliable, often locking up my entire machine. My other applications seem to be running normally...

Finally I uninstalled it [including manually deleting remaining files and folders]. My machine went back to normal, and I started using FileZilla - which may not have as many neato features but is very stable and fast. It's too bad having spent good money on an FTP program for about three months of practical use. But Open Source saved the day for me as buying an upgrade or another package was not an option.