Can I have 2 Hard drives with 2 different OS?

[bothofus]

I currently have 98SE and have a LOT of programs that I use on it.  Can I install another hard drive and put XP on it for all the new programs that require XP?    Can you just pick which one you want to use?

[Raptor]

A lot of programs you currently use under Windows 98Se are bound to work under Windows XP as well.

But yes, it is possible to create a dual boot. It is very easy, actually. Just installing Windows XP on the other HDD should be enough.

Computerhope.com articles are a bit outdated, but this should be helpful: DUAL BOOT WINDOWS 95/98 WITH WINDOWS NT/2000

[soybean]

Can you just pick which one you want to use?

Yes.  A panel will appear soon after you start your computer where you can pick the OS you want to boot.  One of the OS will be set a default.  If you do not respond at the aforementioned panel, the default OS will load after a pause for a certain number of seconds.  You can change which OS is the default one.  And, you can change the length of that pause.