Paste Loses Formats

I have a Windows XP PC with Office 2000 on it. When I copy formatted text using ctl-c from one doc and paste it into another using ctl-v, the text does not retain the formats from the original doc. It gets the format from the doc I pasted into. I used to have a PC with Windows 2000 and Office 2000 and it always worked there. Is there an incompatibility in Win XP and Office 2000?