is there any program/software that can batch convert .ai to .eps .svg .pdf without opening adobe illlustrator?
I'm using adobe illustrator CS3 on PC Windows 7
Nope. If the AI files are saved in the proprietary CS3 format, then Adobe software must get involved somewhere to ensure exact conversion. Inkscape, GhostScript and otehr tools may be able to0 convert some files or specificalyl legacy AI 88 files, but there will be issues no matter what. Your best bet is simply to run batches or use scripts to do such mass conversions.