Question Internet instantly slow when a certain computer is turned on

[SamSmart1]

Hi so at my work I am in charge of the computers and the tech side of my work (I'm the youngest) I have very limited knowledge but I know one thing that the internet should not slow down when one PC is on.

We have 6 desktop PC's and only 5 get used on a day-to-day basis. However, we sometimes need the 6th PC for certain information that we cannot access on our individual PC's. The internet instantly becomes slow once this 6th PC is on, it doesnt seem to matter how many computers are on at the time it just instantly slows the internet down. I have looked into some things that may have been the cause of the slowness in speed such as updating the network drivers, updating the whole pc but I can't seem to get it to work.

Any ideas on how to fix this would be much appreciated!

 

[rgd1101]

malware scan?
windows pc? maybe it doing update?

 

[SamSmart1]

malware scan?
windows pc? maybe it doing update?

Done malware scan, supposingly nothing
PC says its all up to date?

 

[kanewolf]

Done malware scan, supposingly nothing
PC says its all up to date?

What kind of network hardware do you have? Are these PCs all wired, WIFI or mixture ?

 

[SamSmart1]

What kind of network hardware do you have?

Does this mean what provider am I with?

Are these PCs all wired, WIFI or mixture ?

All wired

 

[rgd1101]

use something like glasswire on that pc to see what it is doing

 

[kanewolf]

Does this mean what provider am I with?

No. Routers, firewalls, switches, etc ...

 

[boohoo2u]

What happens if just that 6th pc is turn on, is the internet slow then?

 

[kanewolf]

Done malware scan, supposingly nothing
PC says its all up to date?

Is it possible you have a duplicate IP address?
Is the #6 PC somehow connected twice?

 

[SamSmart1]

No. Routers, firewalls, switches, etc ...

erm im going to be honest I dont have a clue, any idea how can I check. All I know is that its BT's Business Hub

 

[SamSmart1]

What happens if just that 6th pc is turn on, is the internet slow then?

I'm not sure, I've never had the opportunity to check. When I get a chance I will try

 

[kanewolf]

erm im going to be honest I dont have a clue, any idea how can I check. All I know is that its BT's Business Hub

If you are "in charge" as you say in your original post, then you need to figure that out. Why? Because you should have some sort of documentation generated.
Basic diagram. Cables labeled, ports identified. This is basic commercial IT functions. You can't fix, upgrade, enhance your system if you don't understand it.

 

[COLGeek]

DHCP on all? Fixed IPs? Or a mix?

How many wireless devices (like smart phones) are connecting to the network?

 

[Ralston18]

And I will ask:

Make and model modem?

Make and model router (or modem/router if combined)?

Run "ipconfig /all" on one of the "5" computers and then run "ipconfig /all" on that sometimes needed #6 computer.

Copy and paste the full "ipconfig /all" results here. Be sure to indicate which results are for which computer.