What does the BSOD, (Blue Screen of Death), screen say? The STOP error code, if there is one, is important.

Do you really need to get into Safe Mode with Networking? If you are following the advice of a web page like, Bleeping Computer's guidance, they offer a solution to this problem at step 8, ie;

"If you are unable to connect to the site to download rkill, please go back and do steps 3-6 again and make sure the infection has not reenabled the proxy settings. You may have to do this quite a few times before you can get the rkill.com file downloaded. If you still cannot download the rkill.com program on the infected computer, you should download it to a clean computer and copy it to the infected one via a USB flash drive or CDROM."

So if you can, download the software you need on another computer, copy it to some removable media, eg CD/DVD or USB stick, and use that on the infected computer.

Good luck, and I hope that helps.