Help with KWR

hi, i was dloaded korean warrock and it was going through the updating process ( like i got the updater). once the update is done installing PF_01.ZIP it says cannot open PF_01.ZIP. Does any1 know what the problem is? i dont have winrar archiver cuz i removed it cuz i thought tht wuld fix it ... but it dont seem to be fixed. i only have the basic windows unzipper. Please if you know how to fix this, tell me
Thx

restart the updater

i did ... i tried doin everything.. still didnt wrk