yum giving problems

[spai]

Hello all,
I am totally new to lInux and I know I am using fedora (I dont know which version... How do I find out?).
I tried changing the /etc/yum.conf file and now it looks like this:

[main]
cachedir=/var/cache/yum
keepcache=0
debuglevel=2
logfile=/var/log/yum.log
pkgpolicy=newest
distroverpkg=redhat-release
tolerant=1
exactarch=1
obsoletes=1
gpgcheck=1
plugins=1
metadata_expire=1800
proxy=http://iiscproxy1.serc.iisc.ernet.in:3128

# PUT YOUR REPOS HERE OR IN separate files named file.repo
# in /etc/yum.repos.d
[freshrpms]
name=FreshRPMs
mirrorlist=http://ayo.freshrpms.net/fedora/linux/$releasever/mirrors-freshrpms
enabled=1
#gpgcheck=1

[dag]
name=Dag APT Repository
baseurl=http://dag.freshrpms.net/fedora/$releasever/en/$basearch/dag/
http://dag.atrpms.net/fedora/$releasever/en/$basearch/dag/
http://ftp.heanet.ie/pub/freshrpms/pub/dag/fedora/$releasever/en/$basearch/dag/
enabled=1
#gpgcheck=1

[dries]
name=Dries APT/YUM Repository
baseurl=http://ftp.freshrpms.net/pub/dag/dries/fedora/linux/$releasever/$basearch/dries/RPMS/
http://mirrors.ircam.fr/pub/dag/dries/fedora/linux/$releasever/$basearch/dries/RPMS/
http://apt.sw.be/dries/fedora/linux/$releasever/$basearch/dries/RPMS/
http://dries.studentenweb.org/yum/fedora/linux/$releasever/$basearch/dries/RPMS/
enabled=1
#gpgcheck=1

[newrpms]
name=NewRPMs
baseurl=http://newrpms.sunsite.dk/apt/redhat/en/$basearch/fc$releasever
http://newrpms.atrpms.net/apt/redhat/en/$basearch/fc$releasever
enabled=1
#gpgcheck=1

[atrpms]
name=ATrpms - Stable
baseurl=http://apt.atrpms.net/fedora/$releasever/en/$basearch/at-stable
http://ftp-stud.fht-esslingen.de/atrpms/download.atrpms.net/fedora/$releasever/en/$basearch/at-stable
http://wftp.tu-chemnitz.de/pub/linux/ATrpms/fedora/$releasever/en/$basearch/at-stable
enabled=1
#gpgcheck=1

Some other threads suggested the problem I have, occurs if my internet is not working or yum is not configured properly... My internet is fine... thus yum config must be wrong!

The Problem: If I try to run anything on yum I get an error message, like the following:

[root@bsr5 yum.repos.d]# yum update
Loading "installonlyn" plugin
Repository dag is listed more than once in the configuration
Repository freshrpms is listed more than once in the configuration
Setting up Update Process
Setting up repositories
http://apt.atrpms.net/fedora/6/en/i3...ta/repomd.xml: [Errno 14] HTTP Error 404: Date: Mon, 26 Jan 2009 05:05:22 GMT
Server: Apache/2.2.3 (Red Hat)
Content-Length: 324
Content-Type: text/html; charset=iso-8859-1
X-Cache: MISS from s5.serc.iisc.ernet.in
Via: 1.0 s5.serc.iisc.ernet.in (squid/3.0.STABLE8)
Proxy-Connection: close

Trying other mirror.
Error: Cannot open/read repomd.xml file for repository: atrpms