ITunes will not load after upgrade - says files missing

i got a prompt that my iTouch had new software for download. I went to download it and was prompted to download the latest version of iTunes first. I did this and now I can not access my iTunes. I get a prompt that iTunes cannot run because some of its required files are missing.
I am not sure what itunes version I had prevously but it was the latest version until I tried to upgrade. my itouch is version 4.1 (8b117). the itouch unit is a 2nd generaton. i am using windows 7 with IE 8.
Please help. what should i do now? I cant get into my iTunes to sync my iTouch
Thanks
Tim

I found out the issue with itunes. I had been using a converter program to convert movies for the itouch and the one I used also required a quicktime codec that must have interfered with itunes...I uninstalled the program...and itunes is back and running great. sorry to have rushed to judgement. Newfietom

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Itunes library not loading after upgrading

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johnc86,
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When i ran itunes latest update i got a virus from it and now itunes will not open as it says files are missing. i was able to get rid of the virus.

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Where did you download the update from?
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Here is the article for uninstalling iTunes for Windows XP: http://support.apple.com/kb/ht1925
And the article for Windows Vista/7: http://support.apple.com/kb/ht1923

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I had trouble upgrading to version 6 but disabled my anti virus software (McAfee) and the upgrade seemed to run OK. After restarting my computer iTunes won't run as it says files are missing and I need to install them. It was all working fine before. I have over 4200 tracks and I'm worried I've lost them although they are all still on my iPod. What do I do next? Please help.

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I was on itunes and the message popped up asking if i would like to upgrade and install a new version of itunes. I clicked okay. After this was done, I have been unable to launch itunes to update my ipod. I have tried to uninstall both itunes & Quicktime and then re-install both. I have also tried to clear out the temp files, however, I get the following error message...
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Hello Pac80 or anybody else...I took your advice (see below script) on a similar problem you assisted on last week.
I unfortunately am still not be successful in getting access to itunes..any more suggestions?..
1. after I load the upgrade from itunes on my system, i get a dialog box saying "itunes has encountered a problem and needs to close"
2. also i get "error 1905 model C:/Program files/itunes..."
any further advise would be greatly appreciated...cheers..M2
Goto control panel>add and remove in windows and
uninstall itunes AND quicktime. Then go here and roll
down to the section "Clean up iTunes installer files
on the computer"
http://docs.info.apple.com/article.html?artnum=93976
Now disable your antivirus and security programs,
then goto apple.com and download AND SAVE itunes to
your PC.
Once done goto the location you saved it and double
click it to install.
If it still will not open, scan your system with
Ewido www.ewido.com for a piece of adware called
Qoologic

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After upgrading to the latest version of itunes and quicktime it will not open (no error message given). If i log off as administrator and log on as another user it will open. is there a fix for this?

there's a few different things that can cause that on a PC.
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iTunes for Windows: Troubleshooting unexpected quits, freezes, or launch failures

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C:\Program Files (x86)\Common Files\Apple\Apple Application Support\YSCrashDump.DLL is either not designed to run on Windows or it contains an error. Try installing the program again using the original installation media or contact your system administrator or the software vendor for support."
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Taken at face value, you're having trouble with an Apple Application Support program file there. (Apple Application Support is where single copies of program files used by multiple different Apple programs are kept.)
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ITunes will not load after upgrade - says files missing

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