pace 95 tv card

for the tv card: I guess you don't have the right OS running (that's why you're asking the 2nd question, right?).
For the 98/xp: The question is a bit "short" but I'll just try. I guess you have one already installed one and want to install the other so it's not (often) a problem... (always some problems with windows). You just have to put in the CD and boot from it. Each OS need his own partition (remember if you format that 98 needs fat and xp works with ntfs too). When you're done you can choose which OS you want to boot at startup.

If you want both OS running at the same time you can use vmware.

hope it helps and next time, please, explain a bit more what you have. tx.