Computer won't acquire IP address

howdy folks, i've spent a day on this and i'm starting to get annoyed. i got new RAM in and installed it. RAM is rated at 1066 @ 2.2v but when i installed it, it was at 800Mhz. no biggie, i restarted, went into the bios and changed my fsb setting to 'linked' to match my cpu and set voltage to 2.2v. after the computer started up, the screen was jacked up. resolution was different (looked like 800x600) and the colors were all green and orange. and it locked up.

so i restarted, went into bios and changed back to auto setting and voltages. after start up, everything seemed normal and i clicked on internet explorer. no go. so i reinstalled the network adapter for my mobo from the driver cd it came with. nothing. checked network connections and nothing is being received.

so i decided to reinstall the OS. after that, i installed the network adapter. still nothing. just for giggles, i reinstalled the OS and network adapter again. no giggles and still no internet.

i called my trusty ISP and asked them if they need to reset the modem since i reinstalled the OS. after speaking with a couple of different people, i was connnected with tech rep from toronto. she had me power off my computer while she reset the modem. she said the modem was not 'seeing' my computer so had me try a different ethernet cable. still nothing. we looked at my hardware device manager and checked to see if i had any 'yellow exclamation marks' which i did, under 'other devices'. she said my problem was that my OS reinstall was not complete and i needed to finish downloading drivers.

the drivers that i needed were for my video card and tv tuner. i didn't think that was the problem but i loaded the drivers for both anyways and still no internet.

so the problem i see is that my computer will not acquire an IP address. i am able to connect to the internet using a different computer (the one i'm on now) with the same router and modem. i've installed, uninstalled, reinstalled the network adapter several times. i've disabled, enabled the connection several times and after trying to acquire an ip address, it says it has 'limited or no connectivity'. i've tried to 'repair' the connection with the same results.

any help on the issue would be greatly appreciated cause i know squat about network connections. thanks
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It could be your network adapter if you check it some will send but not receive or you may need to put the ip address in manually to get the ipaddress on the computer that is connecting go to start/ run/type cmd and in the black box type ipconfig(space)/all and then use those number to enter them into the other computer changing the last number in the first row to a different number.