An LSP is a "hook" in the TCP/IP stack, usually. I've seen
some viruses and spyware actually add this hook which
requires all TCP/IP communications to pass through the
spyware program that inserted it (or at least a DLL owned
by it).
When I've run into this, I've used a utility called LSPFix
which allows you to see all of the hooks in the TCP/IP
stack. Some spyware detection tools (haven't yet run into
it with the MS AntiSpyware tool) will remove the offending
DLL (or at least notify you of its existance), but then you
have to use the LSPFix program to remove the "hook" from
the list of required files in the TCP/IP stack.
Confusing, yes...
Download LSPFix:
http://www.spychecker.com/program/lspfix.html
Be careful that you only remove files that you know to be
spyware or virus components.
Hope this helps...