ISBoxer Started taking FOREVER to load... Sometimes.

[Buetzel]

Another thing to think about regarding this matter:

I had a problem the last few days with starting my instances (of the game, not those you go into with 5 chars), sometimes only one would get started, sometimes none at all. I just got an error from Inner Space, saying wow.exe exited unexpectedly or some such...

I then noticed a trojan (trojan.vundo.h), which interfered with my online banking (unrelated, i thought) and after cleaning my system WoW works like a charm again, running all 5 instances via ISBoxer like it should.

So - perhaps try using all the known methods for cleaning a computer from viruses... like
http://www.malwarebytes.org/ (this found and cleaned the trojan in my case)
http://www.avast.com (antivirus, in case you dont have one. remember to do a FULL system scan, only letting it run as a background process does not seem to be sufficient)
http://www.freedrweb.com/cureit/?lng=en (another antivirus for online scans, makes sense if your system is already infected and your installed antivirus software is already compromised itself)

There are other tools and I'm obviously no expert in internet security (otherwise I should have made my system more secure so it wouldn't get infected itself...), so you might try more (gmer, osam, whatever comes to mind).