I just upgraded my O.S. to Windows XP Professional - 64 bit and have already encountered some problems. Could someone give me some sound professional advice, please! After installing the 64 bit Xp Pro O.S. onto a new hard drive I could not install my anti-virus program (it states it isn't compatible with XP 64 bit). Am I going to get this from many other programs? Next ,I can't get the 64 bit OS to recognize my 56 k modem, the "Found new Hardware Wizard" doesn't recognize the modem. I tried another modem and the OS found it but couldn't find a driver, which is a problem I never encountered with the 32 bit version of Win. XP Pro. Firstly I'm wondering if someone can help me to get the modem installed and get standard drivers and get the driver list into the 64bit Xp Pro. system. I'm thinking that this version has very few drivers. Secondly maybe someone can point me in the direction of Good anti-vius software that will work with the 64 bit OS. (free anti-virus until I can buy anti-virus would be really nice). Next maybe someone can give me sound advice as to problems with the 64 bit XP Pro. OS and fixes if there are fixes. Thanks in advance !! I know I'm asking for a lot of help.