Back up your wallet.dat before updating. It should be fine, but backups never hurt. Then download new client, uninstall the old one and install the new one. That's it.
Btw, geeks ARE normal people - the rest of you are a bit weird
+1
Will bitcoin.exe run if the wallet.dat file is missing?
If you copy the wallet with 1 bit coin in it and then someone sends you a bit coin....should you overwrite the copy you have?
Where is the data stored for the transactions in the wallet?
Thx (anyone)