if you linux distro doesnt have the Windows folder already added you can do it yourself:
-> Create a new folder in /mnt called 'Windows' or something
-> Fire up the console, and get superuser (yeah the 'su' thing )
-> Navigate to /mnt
-> Type 'mount -t msdos /hda1 /mnt/Windows'

you should be able to get to the Window directory

the breakdown of it is:

-> Mount - Self explainitry
-> -t - the filesystem type
-> msdos - the filesystem, i think WinXP would be typed in as 'ntfs'
-> hda - the harddrive, if you had a second ide harddrive, it would be hdb, scsi is a different value
-> /mnt/xxx - the target folder in linux

hopefully that will help your troubles