Wire less network and dsl connection conflict

i have wireless networking in my office.we have 8 pc's.Dsl connection is working . the problem arise when i
bought another DSL connection for my pc direclty.now the problem is that i could not use my work group on wire less network. but when i disconnect my dsl ,i can able to use workgroup and access other computers.when again i connect my dsl i lost the network sharing again.
is there something conflicting or what?
kindly help me out.