No, if you did you should contact Apple.
no
yes... my sister and i both have an itunes account on the same PC
I don't know. People don't say anythig of the sort anywhere.
You can still keep the same iTunes account.
You should be able to use your iPod and iPod Touch on the same iTunes account on both computers.
If you mean the same iTunes account, then yes. My sister has the same account on iTunes on our home computer as well as her laptop. But if you buy some songs from the iTunes store from one of the computers and you want the new ones on your other computers, you'll have to sync those songs into the other computers' iTunes.
Is it for the same account or do you have another account with them?
iTunes movies are stored in the same parent folder as the music. You can do a search for large files in the parent folder to track down your movies. Remember movies are huge in size and your songs are small.
Nothing happens. Both can coexist with the same iTunes account with no harm done.
Just sign into your iTunes store, or app store on your Mac with the same Apple ID you have on your HP.
There is no way you can take application out of your iPod unless you download app again in iTunes using the same account (if it's not same account you will have to pay again so use the same account to get it for free)
Once you have downloaded an app, you can't download it again in order to have 2 copies of it on the same device. If you delete the app, you can then download it again. If it is a paid for app and you use the same iTunes account then you won't be charged again for downloading it.