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A description of size, shape, color, heigth of leaves, stems and blooms would help narrow the search. Have you asked your local agricultural extension service? This link describes garlic mustard: http://www.nyis.info/index.php?action=invasive_detail&id=25

You might want to consider taking a freshly dug weed to the Agricultural Extension Office in your county. Someone there should be able to identify it.

I world take the plant to your local agricultural extension office for identification then do some online research. With no description or pictures, one would be hard pressed to hazard a guess.

I would suggest you take a recently dug example to your local agricultural extension office for identification.

You will need to know your USDA hardiness zone, found at this link: http://planthardiness.ars.usda.gov/PHZMWeb/

You should find this article helpful: http://southernlivingplants.com/choosing_plants/guide/grow_in_your_zone

I share this link, simply because I use it a lot, both for information and identification. They sell only to "the trade", but this resource is excellent: http://www.monrovia.com/plant-catalog/
The page is interactive.

I would suggest taking samples to either your local nursery or agricultural extension office for identification.