problem uploading to arduino leonardo

i got my latest version of arduino ide uninstalled recently. now i have installed the older version of the software. The software seems very slow. the tools menu doesn't respond quickly. even crashes sometimes. The main problem is i cant even uoload the blink code to my arduino leonardo board. it shows the following error as i upload.
This report would have more information with
"Show verbose output during compilation"
enabled in File > Preferences.
Arduino: 1.0.6 (Windows 7), Board: "Arduino Leonardo"
Binary sketch size: 4,692 bytes (of a 28,672 byte maximum)

avrdude: ser_send(): write error: sorry no info avail
i have tried disabling the bluetooth ports..
i tried uninstalling the driver software and reinstalling it and updating it and still it doesn't work
wud be glad if somebody cud help