Services not working?

I am having real problems with Windows update with one update stuck and I
cannot work out what it is

Windows Vista Home Premium from Dell oem

I cannot do a backup, restore, MMC and print spooling are not working.

Cannot create a restore point and will not configure 1 of 1 update when
restarting -

Problem has been there for two weeks at least - running out of ideas other
than a full rebuild!

Also have this in Problem Reporting....

Product
Windows Modules Installer

Problem
WINDOWS_WCP_OTHER_FAILURE2

Date
14/09/2007 9:40 p.m.

Status
Not Reported

Problem signature
Problem Event Name: WINDOWS_WCP_OTHER_FAILURE2
OsVersion: 6.0.6000
File: base\wcp\identity\id_baseidentity.cpp
Function:
Windows::Identity::Rtl::Implementation::CRtlIdenti tyBase::CRtlIdentityBase_Initialize
Line: 1280
Status: c0150017
OS Version: 6.0.6000.2.0.0.768.3
Locale ID: 1033

Files that help describe the problem
poqexec.log
Cbs.log
memory.hdmp
minidump.mdmp