After exeriencing some print issues with Quickbooks pro 2010, running in XP, I was prompted to upgrade to XP SP3 and have been having a lot of issues. Xp under parallels crashes regulary, and in OS I can't reckognize USB ports until I quit parallels. Now I cannot start XP, and get the following message "Some system files are missing or damaged. You cannot log on at this time. Please use your installation CD to re-install or repair windows. Error code 0x80040507" I do not want to lose all my data under parallels. Please help.