Just bought a season, cant open iTunes any more... Help?

Question

I just bought Season 1 of It's Always Sunny in Philadelphia, but while they were downloading, one of them didn't start, and when I said "check for purchases" it didn't do anything. So I decided to quit because it would prompt me to resume the download when iTunes is opened. When I went back to open iTunes, it wouldn't open.. I double click on the icon on my desktop, but it briefly flashes an icon that looks like a piece of paper with 3 shapes in the middle of it, then nothing happens. What's going on?
(This is my first post, thanks for your help)

Answer 1

I think what you are saing is that you have error message free launch failure with iTunes.exe persisting on the processes tab .
If so this is commonly due to a problem with cryptographic services. Here is a diagnostic Method for working out the problem:
Before checking if iTunes works, restart your PC or close the iTunes.exe process with task manager if it is running.
A couple of simple things to try:
http://support.apple.com/kb/TS1776?viewlocale=en_US
Stop the bonjour service, this FAQ has instructions:
http://support.apple.com/kb/HT2250?viewlocale=en_US
But usually it is due to a problem with cryptographic services.
Check to see if you have your smart card service and that it is not set to disabled. For some reason iTunes needs it.
Start>>Run>>Services.msc
you should find the smart card service in the list. Report back with your findings.
Malware can interfere with cryptographic services and also prevent a resolution so it is important to check that your system is clean before proceeding: Run a virus and spyware scan with up to date definitions.
Then work through *Method 4* in the following link:
http://support.microsoft.com/kb/822798
You should be able to copy and paste the individual lines to save on typing.
Make a careful note of any error messages you get, they are important for diagnosis. Report back any error messages especially the names of any dlls mentioned.
If there are no errors try starting iTunes.