Windows XP Parallels keyboard

Hey guys! Ive been using BOOTCAMP to run Windows on my Mac and play a game on it, but its a pain to have to switch between OS'. So i just got Parallels and everything runs fine except for one thing, the keyboard has an issue. For the buttons shift, control, alt, etc...they work by holding them down, and once you release, they activate. (in game at least) which also means i cant hold the key for continuous skill use and have to push it each time to attack. Ive heard of this problem with others before but havent got an answer from anyone......soooo anyone got one?

Thnx in advance guys!
PS would this be an in game thing or an OS(parallels) problem cuz it works fine in BOOTCAMP.