Hi Digibop and all
Thanks to all for your posts. Below is my 2 cent input. I experienced the same situation after installing COMODO INTERNET SECURITY (CIS) and spent days trying to address being unable to connect to Internet in safe mode with networking. Internet access was working just fine under normal booting. Various replies to Digibop led me to figure out that CIS was blocking access while I was in safe mode. To overcome this, I took the steps below:
1) Boot the computer (with Windows XP Pro) in Safe Mode with Networking: To do that you should boot your computer and then when it just starts hit several times on F8. You will then see a window with several options including 'booting in safe mode' and 'in safe mode with networking'. Using the Up Arrow, select the 'Booting in Safe Mode with Networking' and let XP complete its booting process. If you have a multi-user computer, select your account and double click on it to enter.
2) Start CIS (Start up window)
3) At the Start up window, you see two icons, with one letting you define programs/files that CIS should block and the other letting you define programs/files that CIS should not block.
4) Click on the latter to allow CIS to define programs/files not to block
5) In the window, you see a rectangular block where to enter the full path and name of the programs to allow. For a newbie, please use the browse button to help you find your path to the program you want to include. In my case, I wanted to allow IE, Firefox and Safari. To do that I clicked on the browser button, then on:
a) My computer
c) C:\Program Files\
d) C:\Program Files\Firefox\Firefox.exe
Repeat this for all programs you wish CIS not to block.
5) Close CIS.
Right after closing CIS, you should be able to connect to Internet regardless of the browser.
I hope this helps.