@quovadiz :I tried on 2 W7 x64 machines, I don't get this errors. Menzo sent me your log. I know you already did it, but try one more time :
close the wallet application;
wait 5-10 seconds;
kill the remaining process if needed;
then remove your C:\Users\Your_Name\AppData\Roaming\HighFiveCoin folder (except the file wallet.dat).

You can join our IRC channel at freenode/#HighFiveCoin.

If you have any news about this issue, please post on this thread because you seem to be the only one affected.
Thank you.