20+ Mbps down, 0.04 Mbps up, other strange behavior, hp/compaq dx 2250

My hp/compaq dx2250 exhibits strange behaviors not seen on the other two PC's on my desk (hp/compaq dx2200; dell vostro 3500).  OS on all three is Win XP Pro SP3.   All have VIPRE Internet Security 2012.  Some months ago (when my ISP was AT&T DSL), I tried several Internet speed optimization programs.  The results were not good; and for reasons unknown to me, upload speed was very slow.  I have changed ISP (now Cox Cable business).  I have tried running Internet optimization programs (e.g., DRTCP, TCPOptimizer), but no luck.  One additional fact: when I use a website that involves Java script commands to go to another window, it takes a long time for the command to be executed.

What should be my next steps?

John
cigtoxdocAsked:
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rbudjConnect With a Mentor Commented:
I've not known of windows firewall causing a problem but have you tried uninstalling all antivirus applications (making sure that there are no web filters in place) and disabling the firewall? I've known of other firewalls to cause speed problems.
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southpau1Commented:
The NIC may have to be configured for full duplex instead of auto
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BlueYonderCommented:
Try using a different network jack on the hub, switch, ...
Instead of having the network card automatically detect the link speed, try setting the speed 100.  I.E. 100 MB Full Duplex...
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cigtoxdocAuthor Commented:
I would like to thank southpau1 and BlueYonder for their suggestions.  Changing the jack position on my router did not make a difference.

Setting the NIC to 100 Mbps full duplex did not yield results differing significantly 100 Mbps half duplex or autonegotiation.  Use of the 10 Mbps settings killed the 20 Mbps download speed and did not help the upload speed.

On the speakeasy.net speedtest, the needle on the download "gauge" will not drop back immediately to zero, but will hang midscale, before dropping back to zero.  This does not happen on the other two PC's

John
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rbudjCommented:
There could also be traces of the optimization applications still in the registry. Worth a shot to clean. Try ccleaner: http://www.piriform.com/CCLEANER
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cigtoxdocAuthor Commented:
Thank you, rbudj, for the suggestion.  CCLEANER took out much, but did not fix the problem.

John
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cigtoxdocAuthor Commented:
Thank you for your solution.  I have two other PCs with almost the exact configuration including the settings for VIPRE Internet Security 2012.  Disabling the firewall had not effect, but disabling active protection solved the problem, but so far I have not discovered why.  Disabling active protection for speakeasy.net/speed test did not solve the problem.

John
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