Hi,
HikaShop is not really uninstalled for Joomla, it does not process the SQL file included in the package.
You have to right uninstall HikaShop or you have to run manually the SQL file before doing a "re-install" (which will saw as an update for HikaShop).
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.