You can purchase the latest copy of windows through the internet pretty easily. 98 is an awful version, I'm surprised you aren't more upgraded than that. I used Windows XP for several years and it was a very sound platform. Windows 7 might run you a little bit more money. You can also look into packages(I *think*) and get like 3 user codes at a reduced price, so you can upgrade all the family computers.
If your computer is just running like a slug and things just don't work properly you can always try a reformat. If you are unfamiliar with computers it can be a bit to take in. I would ask around through family friends as it's only about an afternoon process. I wouldn't call any company and have them come out to fix your computer. Often times they promise you faster internet speed and a bunch of other crap, seldom do you get what you paid for. Usually a reformat, windows update and new drivers will fix all the problems you need, plus it's free.
Always be weary of a new program that can fix all your problems. Dozens of new malicious software are developed every single day. Look into a program called AVG(google it) for a free virus protection. I hope I didn't get all long winded for nothing and this makes sense. Good luck.
