Can access a machine by IP only not by DNS name

I have one machine that can access a network share by the IP only but not by the DNS name.  So for example if I type in \\10.1.2.5 everything works great.  But if I type in \\COMPUTERNAME it will give me an error and won't find the share.  Now this sounds like a DNS problem so I typed in ping COMPUTERNAME in the command prompt and it works fine.  

I need to be able to access the computer by DNS name because I have a program that will only work if it can access it that way. PLEASE HELP!

ADDITIONAL NOTE:
There used to be some extra configurations in the HOST file that mapped COMPUTERNAME to the wrong IP address but I have since changed that and restarted the computer multiple times.  Even if I map the COMPUTERNAME to the correct IP address it still won't work.  

Also, there is a program that is installed on this computer called IELock that I can't uninstall.  I am not sure if it is causing any problems or not, it could by spyware.  

Lastly, this is the only computer that is giving me problems.  I probably have 30 other computers that can access this share fine.  
sevenpeaksAsked:
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YourReferenceConnect With a Mentor Commented:
Try the following

Click Start, then RUN

type CMD, and then click OK

Type IPCONFIG /FLUSHDNS, then press enter
Type nbtstat -R, then press enter
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ankapCommented:
Please clarify:
1. Does you network use domain or workgroup?
2. Can you see that computer in the entire network under domain or workgroup?
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torquedtechCommented:
Hi sevenpeaks,
yes you are correct first place to check is DNS,
However it sounds like it is netbios / WINS problem.
First I would see if you can access it via the FQDN (is it in a domain?)
then check to make sure WINS and netbios are correct in the TCP/IP settings

Good luck and let me know what you find
~Dan
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sevenpeaksAuthor Commented:
Wow, thanks for all the comments are such short notice. I did an ipconfig/flushdns and it seemed to have fixed the problem.  Becuase I can now acccess the share just fine.  
Thanks for all of your help.  

By the way the nbtstat command game me an error about not having a the correct drivers or something of that sort, but atleast the ipconfig/flushdns solved the problem.
Thanks,
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YourReferenceCommented:
The nbtstat command would have gave you an error if you do not have NetBIOS over TCPIP network driver installed.  I am glad you have it working.
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