Ok here's the deal: I recently installed an ISDN line and the ISDN modem connects to my PC via the serial port. My problem is that while im browsing, downloading or playing online, suddenly all the downloading/uploading of any data freezes... There is no data transfer and i cant even go to a website. I called my ISP many times, and it isnt their problem... the ISDN modem works perfectly in other computers that i ve tried it... So im thinking... could it be the serial port of my computer? Im saying this cause in the past i had a serial mouse connected there and it was freezing all the time. What do you guys think?