My Dell Demension 4600 w/ an Intergrated 56K PCI Data Fax Modem has slowed down dramatically in recent weeks. Connecting at 16 to 19 kbps. It used to connect at 35 to 50 kbps. I am a MSN customer using a dial-up. I live in the county and dial-up is my only option. What could be causing my slow connection speed? Thanks.