It sounds like it may not be hardware in your case. I'd start
troubleshooting by disabling as many startup programs as possible. If this
fixes the problem then start adding them back in until the problem
re-occurs.

--
Kerry Brown
Microsoft MVP - Shell/User
http://www.vistahelp.ca


"Dasaecor" <Dasaecor@discussions.microsoft.com> wrote in message
news:9D577234-613C-44C4-A163-4124940A8711@microsoft.com...
>I have tested the RAM and the hard drive and both are ok according to the
> diagnostic tools used (Seagate SeaTools within DOS for the hard drive, and
> Memtest 1.70 for the RAM test).
>
> The PSU is an 850 watts BeQuiet! unit.
>
> As the hard drive and the RAM seem to be ok, the last option suggested on
> your email is the PSU, how can I test if the PSU is weak or not?
>
> Thanks.
>
> "Kerry Brown" wrote:
>
>> That's usually caused by a hardware problem, either bad RAM, bad hard
>> drive,
>> or a weak PSU. It could also be a bad hard drive controller driver.
>>
>> --
>> Kerry Brown
>> Microsoft MVP - Shell/User
>> http://www.vistahelp.ca
>>
>>
>> "Dasaecor" <Dasaecor@discussions.microsoft.com> wrote in message
>> news:BE4F1663-853C-4703-A519-97F5828C6E5C@microsoft.com...
>> > Hi,
>> >
>> > I'm manually installing Vista updates, since Windows Update will not
>> > update
>> > properly giving me an error 80073715...
>> >
>> > Problem is that every so often, 3 or 4 updates, the registry file gets
>> > corrupted and windows will not start, having to get back to a backup
>> > copy.
>> >
>> > Any ideas please?
>> >
>> > Thanks.
>>