How to reinstall ...

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I would like to know how to re install the networking key components on an
Windows XP Home system. I am experiencing "funnies" with svhost and the
related DLL in that when I shutdown I get an error message cannot write to
memory location ... Program SVHOST.

Other funny I appear to send data out but none is coming back in. I have
Zone Alarm Pro and this has been set up no to filter the trusted zone at the
moment.

I have run the Windows repair routine but this ssems to create more
confusion than remedy anything.

Which are the critical networking files, programs etc. ?

Thanks for your assistnace.

Speedy
.