Windows 7 Will Not Download Latest Itunes 10.6 Program

Last night, whilst plugging my iphone 4 s into my windows 7 based PC with 64 bit to back up my phone things went horribly wrong.The system told me in itunes that i need to down load the latest upgrade for itunes.I tried this and with my phone plugged in through a USB port to charge it went haywire.At the same time, as i was down loading the latest itunes 10.6 update, up pops the words "A network error occured while attempting to read from the file: C:windows installeritunes 64 msi". So i went back to the download page and clicked on the other download link and this time this message came up;This itunes installer is intended for 32 bit versions of windows. Please download and instal the 64-bit itunes installer instead.I could not find that installer so used other recommended installers, to no avail.I tried re-installing the 64 bit version at least 6+ times from other sites, but the same error message keeps coming up as the 1st one i wrote above.My iphone 4s is stuck on a picture showing a USB cable going to an itunes symbol. It will do nothing. It won't turn on/off and now my computer won't even recognize it when plugged in! Where did the driver go all of a sudden?I reset my PC to a couple of days ago, then tried loading the program again, made no difference. I have updated drivers, iphone on the list, but not showing any problems.I need to go get another phone now as i run several small businesses and need client contact all the time, but will answer this forum as soon as i can.