usb lan: would this be a reason why I got poor net reception?

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Hello computer-expert guys, I need your suggestions and ideas... As far as I know, this is my first posted script here on this interest because I never really had any serious problem with my PC. Recently as what I observe I got very poor (slow) net performance from my ISP. I knew even before this is not a problem from them (ISP)but maybe from some of my accessories. By the way, for three years (until the other day), I was using only USB Lan replacing my original one. Since I was satisfied with the performance of USB Lan (which more economical), I bought another one but not anymore the same as my former one because as what the saleslady it was already replaced with the new version. I installed it and it's running until now. But as what I observed these few days back, I got different performance compared to my former one. I got slower response from my browser. Does the new USB LAN (I installed) the reason why? Another concerns: I have a monitor using dvi cable permanently, I mean, I could not replace it for another cable that has VGA cable so I could connect to my CPU (which has VGA jack). The monitor is originally FUJITSU brand (from Japan) and I would have to connect it to my HP CPU which has VGA jack. Fujitsu monitor has separate voltage regulator instead directly would take supply from my HP CPU. Is there any chances that I could still connect my Fujitsu to my HP CPU? If there is, how is it possible my friend/s? Your suggestions and ideas are highly appreciated.. P.S. We are using 220V and am sure Japan are comfortably using only 110V. Thanks a lot. Mobhomeir here.. 040912