How can I narrow down what's causing CRC errors over internet downloads?

I'm trying to determine if its something wrong with my hardware configuration, my software or my actual internet connection that is giving me trouble.  
Recently with my new build I am noticing all my downloads being large or small ending up either not fully downloaded or just full with CRC errors.  
I'm not even sure where to begin as I've been trying to troubleshoot this for a few days and it just seems to keep getting worse.  
My initial problem was the new nforce ide drivers that didn't quite gel with my optical drives.  I ended up unstalling the ide drivers and my optical drives worked correctly again.  (problem with optical drive was when you put a dvd writer (lite on 411s) in the system would freeze and not play the movie until the disk was ejected - then everything would return to normal)
After trying to find a fix or someway to get the drivers to work I started to notice I had trouble downloading large files off news servers.  For the past 3 days I just downloaded random stuff that looked to be complete as in all the files were there with pars.  I download the files and the winrar gives me crc errors and the pars say the files are incomplete.  
Then I start to try to download any large file off the internet - game demos mostly off gamespy.com and the downloads just stop midway.  
All these problems just started to add up and I'm having a hard time trying to narrow down and knock off what it is and what not.  
Basically to start is there a way I can see if it's something related to my ide drivers, aspi drivers, internet connection, cable problem etc.  Please help, it's driving me nuts.  =)
System
AMD 64 3000+
PQI Turbo 1 gig
Neo K8n Platinum (Bios 1.4)
Lite on DVD
Lite on 411s DVD writer
PNY 6800GT
Antec 420 TruPower (20amps on 12v)
Audigy 2
Help me please..  

Are you running xp sevice pack 2?  I was having issues with having to refresh my browser several times to get a page to load,   and downloads sometimes stopped.
I downloaded the following sp2 patch from microsoft and it fixed the refresh issues,
http://www.winnetmag.com/windowspaulthurrott/Article/ArticleID/44014/windowspaulthurrott_44014.html
If you are browsing while the download runs,  it could be sp2's new 10 connection limit.   I tweaked it to 50 connections and fixed ie stalling when loading long forum pages with alot of signatures present.  (I tweaked it with xp-anti spy)
Can you tell Im guessing?
Possibly a bad ide or sata cable?
Have you tried running memtest to test for errors?   I prefer goldmemory as I believe it is more sensitive to errors with an a64.   It found errors memtest didnt.
This system is giving you a much harder time than it should.  Maybe you have a flaky board or memory errors.
good luck at any rate.  (p.s. its 3 am here,  couldnt sleep,  prob not making alot of sense at this point.  lol)

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