What file is detected as Kuang virus? Didn’t you use any Panda AV tools before? Kuang is often detected in files left by Panda… i.e. a false alarm caused by Panda not encrypting their virus signatures.

As for the textfile… it’s strange. It is also possible that Virus Cleaner has some problems with your configuration.
Please, start regedit.exe (e.g. using the Start menu / Run), in the left part of the window (tree) navigate to HKEY_CLASSES_ROOT\txtfile\shell\open\command, and when the command key is selected, check the right part of the window - what is the (Default) value?