Routing to a small number of, most probably 'malicious,' servers - how to block?

I am a professor and environmental activist with ongoing security issues with my communication devices. It appears that my TOR Browser is being routed to the same IPs over and over again. And, these IPs are included in a list of spamming/hijacking IPs that was posted on the Internet. I'd say that my computer regularly connects to about 2/3 of the addresses on this list of smamming hijackers. My range of server nodes that my computer uses to connect to the TOR network seems to be quite small. The following list should also include some server called 'dreamatorium' and another called 'badexample.'

109.163.233.205 - - [30/Apr/2012:03:28:55 +0200] gorz.torservers.net 66.7.205.164 - - [30/Apr/2012:03:29:01 +0200] torsrvh.snydernet.net 87.225.253.174 - - [30/Apr/2012:03:29:05 +0200] torproject.org.all.de 199.48.147.35 - - [30/Apr/2012:03:29:09 +0200] tor-exit-router35-readme.formlessnetworking.net 93.182.132.100 - - [30/Apr/2012:03:29:13 +0200] exit1.ipredator.se 85.24.188.63 - - [30/Apr/2012:03:29:16 +0200] h-188-63.a189.priv.bahnhof.se 77.247.181.162 - - [30/Apr/2012:03:29:18 +0200] chomsky.torservers.net 84.55.117.251 - - [30/Apr/2012:03:29:19 +0200] 84-55-117-251.customers.ownit.se 46.165.196.182 - - [30/Apr/2012:03:29:37 +0200] ns2.kharlamov.co 199.48.147.36 - - [30/Apr/2012:03:29:38 +0200] tor-exit-router36-readme.formlessnetworking.net 62.113.219.4 - - [30/Apr/2012:03:29:40 +0200] tor11.anonymizer.ccc.de 178.217.184.147 - - [30/Apr/2012:03:29:40 +0200] torexit.pl1.william.ir 77.247.181.163 - - [30/Apr/2012:03:29:41 +0200] lumumba.torservers.net 77.247.181.164 - - [30/Apr/2012:03:29:47 +0200] rainbowwarrior.torservers.net 77.247.181.165 - - [30/Apr/2012:03:29:48 +0200] politkovskaja.torservers.net 93.182.132.103 - - [30/Apr/2012:03:29:50 +0200] exit2.ipredator.se 146.185.23.179 - - [30/Apr/2012:03:29:51 +0200] torland1-this.is.a.tor.exit.server.torland.me

My university email browser posts the address for the server from which I connect to the university server to access my email. This is the reason I know which servers I am connecting to. How do I stop the browser from going through particular servers or allowing malicious IPS to connect? I am sure that I am not explaining this clearly, but I hope that you can decipher the problem. I am not a computer person, but I have a PhD and when looking at all of this, it appears that my connection is being routed to particular servers!!!