Reinstallation can't help. You need delete this files manually from appdata folder.
Deleted all files, except exe file, clean the windows register - don't work. all the same
Which folder you've used to do this
You need to to this in
%APPDATA%\Litecoin folder:
Go to Start -> Run (or press WinKey+R) and run this:
explorer %APPDATA%\Litecoin
Litecoin's data folder will open. For most users, these are the following locations:
C:\Documents and Settings\<YourUserName>\Application data\Litecoin (XP)
C:\Users\<YourUserName>\Appdata\Roaming\Litecoin (Vista and 7)
Note that "AppData" and "Application data" are hidden by default. Unhide from:
Control Panel -> Folder Options -> View -> Hidden files and folders -> Show hidden files, folders or drives -> OKBeware to NOT delete wallet.dat. You'll simply lose your coins.Finally, an advice from me: I usually dig Google heavily, before giving up and asking questions. Google is man's best friend, the dog is the second best only