Being You, i'll try:
1) Applying all the service packs to both Paradox (Stay away only from the SP4, it messes upp Paradox) and windows
2) Verify the format of your pictures, they could be damaged, you can also try to convert to BMP before importing
3) try on another system with XP Pro and no other app installed, since it can be some other app which locks paradox.
Bye!