save the private key from the wallet. EG if using bitcoin-qt. go to the command prompt and do the dump private key command. save the private key on a word document, print it out.

then save the wallet file itself in a different directory of laptop, on a memory stick.

that way you now have:
original wallet in its default location
elsewhere on PC
on a memory stick
on paper.

just be sure no stranger you dont trust finds the bit of paper and works out what it is. make sure no stranger has access to your PC and make sure you dont download precompiled programs related to bitcoin unless verified by a truly trusted party. (EG never the creator of the qt / mining program... but some unaffiliated person of good rep)

.. i personally have it in paper form. printed 10 times and scattered in different locations, my family have access to it. but that is it