"no valid digital signature" can't install downloaded programs

[7h95g]

A friend's computer has gotten completely messed up
after I installed additional memory on it. The memory
has been set in the BIOS to run at conservative settings
(so I don't believe it's the cause of the problems).

It's a P3 with 768MB of RAM running XP home.

It used to have Norton Antivirus on it but that seemed to
have gotten corrupted and we tried to remove it.
I think it's completely off the system but can't be sure.

There's multiple problems now:

The computer crashes frequently as it boots into windows.

We downloaded AVG free but can't install it because Windows says that
it (and any downloaded program) doesn't have a valid digital signature.

Any help would be greatly appreciated.

Thanks

 

[Og]

A friend's computer has gotten completely messed up
after I installed additional memory on it. The memory
has been set in the BIOS to run at conservative settings
(so I don't believe it's the cause of the problems).

It's a P3 with 768MB of RAM running XP home.

It used to have Norton Antivirus on it but that seemed to
have gotten corrupted and we tried to remove it.
I think it's completely off the system but can't be sure.

There's multiple problems now:

The computer crashes frequently as it boots into windows.

We downloaded AVG free but can't install it because Windows says that
it (and any downloaded program) doesn't have a valid digital signature.

Any help would be greatly appreciated.

Thanks

1.) the new memory is not compatible with the motherboard
or
2.) the new memory is not compatible with the old memory
or
3.) both of the above
First step of troubleshooting: Undo what you did do.
Pull the new stick of memory; the problem should vanish as mystiously as it
arose as soon as you put in the new stick of memory.
Steve

 

[7h95g]

1.) the new memory is not compatible with the motherboard

The new memory fits the precise specifications of the motherboard, I
checked before it was ordered.

2.) the new memory is not compatible with the old memory

the old memory was removed

3.) both of the above

First step of troubleshooting: Undo what you did do.
Pull the new stick of memory; the problem should vanish as mystiously
as it arose as soon as you put in the new stick of memory.
Steve

Steve, the computer booted up fine several times after the new memory was
installed, but somewhere along the line AFTERWARDS as I was trying to
download and install Firefox, google toolbar, updates to anti-spyware
programs things started to get crazy with black screens and reboots.

I tried to do a system restore but it wouldn't work. Tried to do a system
file check but that wouldn't work either.

Thanks

 

[Og]

The new memory fits the precise specifications of the motherboard, I
checked before it was ordered.


the old memory was removed



Steve, the computer booted up fine several times after the new memory was
installed, but somewhere along the line AFTERWARDS as I was trying to
download and install Firefox, google toolbar, updates to anti-spyware
programs things started to get crazy with black screens and reboots.

I tried to do a system restore but it wouldn't work. Tried to do a system
file check but that wouldn't work either.

Thanks

You still have a memory-related problem -- either Operating System files are
being corrupted as they are read INTO memory, or they are corrupted when
they are read back OUT of memory.
1.) Open the case and double-check that the ribbon cable is solidly
seated, both at the Motherboard and at the Hard Drive (sometimes these go
ajar when installing memory)
2.) Replace the new memory with the old memory and see if the problem
goes away. I says this because somewhere around 90% of Electronics (such as
memory) failures occur within the first 30 days of usage
3.) Determine the manufacturer of the drive, go to their website,
download their Drive Diagnostics utility, and check the hard drive. If the
utility detects errors, time for a new drive
Let me know what you find,
Steve

 

[7h95g]

You still have a memory-related problem -- either Operating System
files are being corrupted as they are read INTO memory, or they are
corrupted when they are read back OUT of memory.
1.) Open the case and double-check that the ribbon cable is solidly
seated, both at the Motherboard and at the Hard Drive (sometimes these
go ajar when installing memory)
2.) Replace the new memory with the old memory and see if the
problem goes away. I says this because somewhere around 90% of
Electronics (such as memory) failures occur within the first 30 days
of usage 3.) Determine the manufacturer of the drive, go to their
website, download their Drive Diagnostics utility, and check the hard
drive. If the utility detects errors, time for a new drive
Let me know what you find,
Steve

Steve,

You were right - I believe it WAS the memory. I replaced the IDE drive
cable with a 80 blue-end cable because the bios had been complaining about
that. I ran Maxblast (the drive is an old 20gb maxtor) but there's no
diagnostic tests on it. I replaced the new 3 sticks of 256MB PC133 with
the old one stick of 128MB PC100 memory and the sudden black screens and
reboots stopped ocvcurring. We managed to get Norton Antivirus 99% off the
computer (although recycler still remains).

I managed to get AVG installed.

The MB is a Tyan S1854 Trinity 400.
ftp://ftp.tyan.com/manuals/m_s1854_202.pdf
http://www.tyan.com.tw/support/html/memory_s1854.html

So here's my last question:
When I took out the one stick of Crucial 128MB PC100 and replaced it with
three PQI 256MB PC133 I didn't change anything in the BIOS. Was there
something I should have changed because the old memory is 100 and the new
133?

We're about to send the new memory back to Newegg but maybe it's
appropriate memory, just needs changing some settings in the BIOS or a
jumper.

Thanks

 

[Og]

Steve,

You were right - I believe it WAS the memory. I replaced the IDE drive
cable with a 80 blue-end cable because the bios had been complaining about
that. I ran Maxblast (the drive is an old 20gb maxtor) but there's no
diagnostic tests on it. I replaced the new 3 sticks of 256MB PC133 with
the old one stick of 128MB PC100 memory and the sudden black screens and
reboots stopped ocvcurring. We managed to get Norton Antivirus 99% off
the
computer (although recycler still remains).

I managed to get AVG installed.

The MB is a Tyan S1854 Trinity 400.
ftp://ftp.tyan.com/manuals/m_s1854_202.pdf
http://www.tyan.com.tw/support/html/memory_s1854.html

So here's my last question:
When I took out the one stick of Crucial 128MB PC100 and replaced it with
three PQI 256MB PC133 I didn't change anything in the BIOS. Was there
something I should have changed because the old memory is 100 and the new
133?

We're about to send the new memory back to Newegg but maybe it's
appropriate memory, just needs changing some settings in the BIOS or a
jumper.

Thanks

1.) Go to http://www.crucial.com/ and use their Memory Advisor. Then you
will know exactly what Crucial Model # to order from NewEgg
2.) Most MoBos adjust memory bus speeds (eg. 100, 133) automatically. Read
your MoBo manual to determine if you need to make BIOS adjustments.
3.) Some MoBos require that memory be installed in pairs; others have a
specific slot order that odd-numbered memory sticks must be placed in.
Again, read your MoBo manual.
Good luck,
Steve

 

[Pop`]

7h95g wrote:
.... The memory

has been set in the BIOS to run at ***conservative settings***
(so I don't believe it's the cause of the problems).

What the heck does that mean?? It may well be your problem?

Pop`

 

[7h95g]

7h95g wrote:
... The memory


What the heck does that mean?? It may well be your problem?

Pop`

cas 3 instead of cas 2

not turbo or fast

that kind of thing

make sense now?