[HDD] Cannot access files from external hard disk due to permission error

I have an external hard disk which has 1 partition, formatted in NTFS. I use this drive on multiple computers, with different logins, and with different operating systems (Windows XP and Windows 7). All files are plain old files, not OS encrypted or compressed. However, Windows 7 does not let me access some files, for I don't have "citing permissions".
Is there a simple way that I could access the files/directory on a partition, apart from taking ownership and setting appropriate permissions? I really find this process very tedious.
Thanks ahead.
