Good sites for computer-fixing at home?

Long story short:
Have spent the past week troubleshooting problems on home PC. Running Win 98 SE. One problem yet to be resolved: When I connect to the Net via MSN, I get a “page can’t be displayed” message and a “DNS error or can’t find server” message."
I’ve been into the network neighborhood properties many times, checked the configuration, everything looks to be in order, but still no luck.
I also cannot get into my internet connection wizard because now it says I’m “restricted.”
Tech support hasn’t been of much help.
So…do you know of any good sites I could visit from public computers to get info on fixing the above problems?