if you followed the guide to a point, as you say, the problem likely lies outside of your computer.
Although it is curious. I stopped playing for about a month, and i claimed my account after i stopped playing (before EQEmu went crazy too). However I just logged on a few times over the weekend. I got a couple errors trying to log in (i knew i would, but i wanted to see what would happen anyway), and all i did was download manual patch, and just to be safe, redownloaded hotfix and installed both. After that i was able to log in just fine (in fact login seemed faster ???).
for the sake of new players i'll try to help ya out, even tho it may not even be a problem with your machine. Please post up very detailed steps on what you did, from EQ install to logining in. list what you downloaded where and what you did to install it (where you put it once you had it). folder names and such would be appreciated. i'm just trying to be thurough, you understand.