Fingerprint readers are more for the illusion of security rather than actual security.
If a knowledgeable attacker has physical access to your PC, your data is theirs - at least in Windows-land.
Some (Microsoft fingerpint reader, I'm looking at you) send the authentication in plain text rather than cyphertext.
Some have accepted the latent image left by the last user when it has been opaqued by breathing heavily on it.
Many fingerprint readers can be fooled by soft candies. (eat the evidence afterwards!)
Or you can make your fake print out of PVA adhesive so you can use it again and again.
Some people who handle rough or abrasive materials frequently (hello, woodworkers) or who have dirty skin may not have fingerprints that are clearly defined enough for reliable, repeatable identification with a fingerprint reader.
If you find it hard to remember decently strong passwords, one solution that provides a dictionary attack proof password is to use the first letter from each word in the chorus of your favorite song.
For example, if your favorite song is "Now I wanna sniff some glue" by The Ramones, then the lyrics "Now I wanna sniff some glue, now I wanna have somethin' to do" gives you the password niwssgniwhstd - which is unlikely to be guessed by anyone!
Remember that all data protection can be bypassed with rubber hose cryptanalysis.
