We know nothing about your system nor do we know anything about the files. It stands top reason that they are in a format AE simply doesn't understand. And well, special characters like question marks have no place in user folders and can cause all sorts of trouble. Rename your folders appropriately.
IM running windows 7 with the latest device pack update.
i Do not use use question marks in naming files im just saying that's the warning I get and I have no idea why
ive ttied importing files such as avi, MPEG, which according to the help section should all work but they dont.
I see. What is the source of the files? Which MPEG format exactly? also try to move your storage folder off the desktop. You could have a permissions issue there. Likewise, check your cache settings. I get the weird feeling that this actually has to do with some secondary files like some temp cache files or the extracted audio....