Question for computer geeks Re: Windows operating systems

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I'm having problems with my computers.

Two computers at work are networked together, one with Windows XP Pro and one with Windows ME.

The Windows ME computer gives me a lot of grief. Programs freeze, the computer crashes, and I can't run two programs at the same time.

My software vendor told me Windows ME is unreliable and I should upgrade to Windows XP Pro.

1. Is there any way to fix the glitches in Windows ME without upgrading to XP?

2. Can I take my Windows XP disk which came with my one computer, and use it to install Windows XP on the other computer (both are Pentium 4 machines).

3. If I install Windows XP on the second computer can I do this without removing the programs I have installed there?