try this:
-copy the table in word (ctrl-c)
- in powerpoint, don't simply click insert or ctrl-v, but rather go throught the menu: grumble my pp at home is in german and I can't for the life of me remember what the thing is called in english - it's the second menu-item from the left, anyway, just after "file"
- then you will find, somewhere near the item "insert" in that menu, a similar item, which will be called something like "insert contents"
- in the menu that opens up, choose "insert microsoft office word document"
this should work, and i believe has the added advantage that the word-document and the powerpoint are then linked, so that if you later change something in the word table, it is automatically also changed in powerpoint.