Wireless range/signal seems very weak

I have only been able to find info for the 555, not the 572. Bit it MAY apply.

See if there is a reset button in the back of the unit. Press and release to reset the router.

Press and hold for 5 seconds and it will reset with everything for the factory defaults.

As I said, this actually pertains to the 555, but it may also work for the 572.

Have you tried moving the computer upstairs to a different place to get the best signal ?
What is the signal strenth?
Have you tried moving the router to a different position?
If your signal strength is quite weak, you may need to get a more powerfull router, like this one http://bestofferbuy.com/2.4GHz-1000mW-High-Power-802.11b/g-WLAN/WiFi/Wireless-Broadband-Router-p-50909.html?currency=GBP&utm_source=gbase&utm_medium=cse&utm_campaign=gbase
they are about twice as expensive.

do you have a connection in your modem?
cause if you do you need to set up the router in bridge with it means it has to be on DHCP (the configuration)

Check the type of encryption the 572 is set for, I've found a few cases where it needs to be WPA and not WEP. As a temporary measure, you could switch off wireless security.
Lastly, check your not getting a channel conflict, if a neighbour has a wireless access point with the same channel, you may get problems, which will require logging onto the 572 and changing the wireless channel

yeas you should be able to as long as you know the passkey to connect to the router. windows should detect the wireless netowork automaticlty and you just select to connect

you can try to google password genius

Hello Peter. I think you may have pinned down the problem within your post. British brick walls can be very solid - and thick - which may well be enough to degrade or block your wireless signal.

The first thing I would try is to move the router to as open and central a position as you can, and see if that helps. Adding a wireless LAN antenna to your router can also help boost a weak signal a little (these just replace an existing antenna on the router).

However, other options you may want to investigate include:

1) using a wireless repeater to boost the signal from your router;
2) a powerline networking system, such as Homeplug ;
3) installing a new router with a more powerful range

..or indeed, abandoning wireless altogether and using a wired connection!

I hope this helps you explore some options, and find a solution.

Are all the cables connected correctly?
Are the DSL settings in?

If it's only the power light, and no WLAN, LAN, DSL or Internet lights on, it sounds like it may be faulty. Is it brand new or second hand?

You can try this link, this has a step by step instruction and screen shots as well. I hope this one helps.

http://portforward.com/english/routers/wireless/Siemens/Gigaset-SE587/wireless.htm