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Considering your description of the problem, I am assuming that all the computers (and the PS3) are connected to the same wireless network (if it’s not the case, please repost with the details). The most common factor causing intermittent problems with wireless signals is interference caused by metal or electronic devices like cordless phones, microwave ovens etc. Try to keep the computer closer to the router and try again.

If the problem persists, change the wireless channel of the router:

1. Click Start, type ‘cmd’ in the search field and press Enter.
2. In the Command Prompt window, type ‘ipconfig’ and press Enter. Note down the ip address of the router (the one next to ‘Default Gateway’).
3. Type the address you just noted in the address bar of your browser and press Enter. This should open the router’s user interface.
4. Look for options similar to “Wireless> Wireless Settings” and change the “Channel” drop down value to a different value (most wireless devices in the US are set to wireless channel 6 by default, so you can consider changing it to either 1 or 11 and check if the signal strength improves).
5. Click ‘Save Settings’ or ‘Apply’.
6. You can refer to the router’s manual and 'reset' it if these steps do not work.

Hope it helped. You can go through http://www.microsoft.com/athome/setup/wirelesstips.aspx for additional tips to improve your wireless signal.

Here’s to Good Karma