This is actually a really common misconception. The technology works differently than most people think. I'd recommend reading HowStuffWorks.com for a good beginner explanation before diving into the technical details.

I learned the hard way to always back up before messing with this kind of thing. Burn a CD-R of anything important first. It takes 10 minutes and could save you from losing everything if something goes sideways.

I dealt with this same issue last year. The key thing is to make sure you're using the latest version of your software and check forums like Slashdot or Ars Technica for specific fixes. Technology changes so fast that advice from even 6 months ago can be outdated.

Whatever you do, don't pay some 'computer guy' $80/hour to do this. It's a 20-minute job you can handle yourself. There are step-by-step guides all over the web with screenshots. Save your money for a faster modem or more RAM.

Honestly the manual that came with it explains this pretty well if you actually read it. I know nobody reads manuals but for once it's worth flipping through. The troubleshooting section in the back covers the most common problems.

Be REALLY careful what you download to fix this. Half the 'free fix-it' programs you find are spyware in disguise. Stick to known-good stuff like the tools from major sites, and always scan downloads with your antivirus before running them.