Snail's Pace Internet Downloads.

I have been having problems recently trying to download files from the internet on to my DELL Dimension 4500 computer     Today, the computer finally managed to complete the Pitstop tests but the whole process took over one hour.     Most of the results were similar to those I have received in the past, but the measured download speed was only 55Kb/s, clearly an intolerably slow speed.    The upload speed was about 600kb/s.   The details of my system are given below:

I have run various programs, Disk Cleanup,  Spybot, Registry Mechanic, Defragment, Pitstop Optimize2, and Disk MD, all of these before running the Pitstop tests.   My other two computers are not affected by the problem and give tolerable results in the Pitstop tests.  I am using my laptop to send this message.

I have searched through a number of Dell Forum messages without finding information or advice to help me solve the problem.

Please could someone advise me on the steps I need to take to identify the source of the problem?

thyde

Dimension 4500, 2.53GHz processor, 1024Mb DIMM, Windows XP, 20Gb hard disk, 80Gb hard disk, Roxio CD R/RW, Blueyonder Broadband & LAN, Dell Photo All-in-One printer. Iomega 500Gb hard disk

Dimension 4100, 1GHz processor, 256Mb SDRAM, Windows ME, 20Gb hard disk, Adaptec CD R/DW, HP Deskjet 840C, Scanjet 3300c, Blueyonder Broadband & LAN

Inspiron 8600, 1.4 Ghz processor, 512Mb SDRAM, Windows XP Home, 40Gb hard disk, Philips CDRW/DVD disk drive, Blueyonder Broadband & LAN

Netgear RP614 v2 router.