infected or deleted wrong file(s)

[honvetops]

2 computers hooked up on wireless local lan. (Home) , I have the host puter on wireless d-link with my dad's in another house. I received an error last weekend that my wndws media player had a problem and needed to empty the DNS Cache ?  I searched DNS Cache and found many, and started deleting files , I received  a couple don't delete warnings and skipped those deletions. I had no problem connecting online after that but noticed my media player still won't work-online, it will play local music and stuff but won't play mpegs, and video.... Yesterday while at work , I tried to send an email to the 2nd computer in my dad's house and received this  delivery status notification....to my email account at work......

Message/delivery-status

Reporting-MTA: dns;E4SMTP05
Received-From-MTA: dns;E4SSL03
Arrival-Date: Tue, 5 Sep 2006 04:12:45 -0700

Final-Recipient: rfc822;[email protected]
Action: failed
Status: 5.0.0
Diagnostic-Code: smtp;554-:  (RLY:CH)  
http://postmaster.info.aol.com/errors/554rlych.html
554 TRANSACTION
FAILED
NS (PTR record) assigned.
addresses which
220      have no reverse-DNS (PTR record) assigned.
addresses which
220      have no reverse-DNS (PTR record) assigned.
ddresses which
220      have no reverse-DNS (PTR record) assigned.
 which
220      have no reverse-DNS (PTR record) assigned.
ions from IP addresses which
220      have no reverse-DNS (PTR record) assigned.


ns which have installed a backdoor to allow spammers to use
550-your computer. Either configure these programs, disable them
services or
550-correctly name your computer with a FQDN (and sack your IT guy for
being
550 clueless)
ou are trespassing.
220  
 you send us spam, you are trespassing.
220  
 or sent over this system may be monitored.  Use of this DoD computer
system, authorized or unauthorized, constitutes consent to monitoring of
this system.  
220 Unauthorized use may subject yo
220 Unauthorized use may subject yo

"besides having to sack myself , what did I screw up"?  Also;  last night I hit F8 on the startup and logged on to a previous safe session, ran 2 complete scans with ewido, have a defender 15-n-1 firewall up on high settings* ?  thanks 4 any help here...
 

[unlovedwarrior]

uninstall and reinstall the media player and see if that helps...

and this might help also

http://mapname.com/clean-dns-cache.htm

unlovedwarrior

[patio]

The DNS cache has nothing to do with Media Player of any sort other than allowing thos e programs to access info over the web.
The 2 things are not related.
In future when you feel the need to flush..... open a command prompt window and type "ipconfig /flushdns"

patio.    8-)

[unlovedwarrior]

patio is there a way to see how full your dns cache is?

[honvetops]

thanks  both of you for the  HELP