I have lost the password for my Bitcoin-qt (have close to nothing in it), and I need to reinstall it but I don't want to waste my time downloading the whole blockchain. Can anybody tell me how to do this?
Don't do what the previous poster said, that isn't necessary
Do this instead:
1- Close Bitcoin-qt
2- PRESS WINDOWS + R key.
3- Write: %APPDATA%
4- PRESS ENTER
5- CUT the file wallet.dat and paste in other location like C:\ (this is a backup of your wallet.dat, should you ever remember your password you can use this to access your lost Bitcoins again)
6- Open Bitcoin-qt again
Tada: Fresh wallet
Yes, but maybe cause problem's with cache files of windows.