How do I upgrade my laptop without a web connection? I recently changed my ISP, to a fibre optic cable service. Previously my wireless router used WEP encryption, the new one doesn't seem to like it and is set up to use WPA-PSK. The problem is that although my Windows 7 laptop copes with this arrangement, my XP desktop does not. It does not acquire an IP address and consequently does not connect to the Internet. The technical literature supplied with the new router suggests that a Microsoft update, included in Service Pack 3 may fix this problem though this was installed some time ago. Unfortunately, as I cannot get onto the internet via my desktop, I cannot download and reinstall this update. Colin Hughes, by email You are on the right track though the SP3 update you mention is a WPA (wireless protected access) security patch and I suspect the one that you need is KB81585, which provides Windows XP with WPA support. All you have to do is download the patch on your laptop from: http://goo.gl/zFs64, save it to a USB flash drive, copy the file to the hard drive on your XP computer and run the installation program from there.