Unfortunately Impulse and many of our other software are not supported under XP 64.
Suanough, try downloading the following file:
http://sd.stardock.com/curthendzell/fix_impulse_installer.reg
save the file and run it. If in Firefox or a non-IE browser, you may have to go to File > Save Page as... if the link shows as plain text (if you're not sure, just follow the link in Internet Explorer). Once you do this, try installing Impulse from the latest installer here: http://www.impulsedriven.com/impulse_setup_full.exe