IDE loading issues

Loaded latest IDE to a win8 machine, worked ok for a while, then after I tried saving a library, it hung up. After that it never loads at all. Have tried loading IDE with DOS commands also. Surprisingly, after trying to open IDE directly or through the DOS commands, it would open up about an hour later.
Initially it gives the standard opening error.
Please help / advise

Thank you.

Fixed the Launch 4j problem by renaming the arduino folder which the program created in my documents folder. Initially tried to erase all files in it and folders too, found files nested multiple times in same folders. Delete did not help. After renaming the folder and starting the IDE, it gave a message that there is no folder and it will create one itself. I pressed OK and the problem is gone.