Linker Problem

ok im tring to link a DLL, the .asm compiled fine and it produced an object file.. but when i link i get this error:

Linking...
Microsoft (R) Incremental Linker Version 5.12.8181
Copyright (C) Microsoft Corp 1992-1998. All rights reserved.

Creating library DskTopHk1.lib and object DskTopHk1.exp
LINK : error LNK2001: unresolved external symbol __DllMainCRTStartup@12
DskTopHk1.dll : fatal error LNK1120: 1 unresolved externals

Link Finished - 2 error(s), 0 warning(s)


any ideas how to resolve this?
thanks!
andy