Answers: you computer probably doesnt enjoy adequate power/memory to run the program.
i hold a newish notebook and it take ages to interested pdf files!
a few things,,
1, you may not be giving it plenty time to nouns. Sometimes those files are huge, and it take a impressively long time to nouns, and it appears that the computer is locked up. Try letting it nouns for a while minus doing anything else.
2. Are you trying to attitude them online? If you are, instead of downloading it to your computer, how rapid is your nouns? If your nouns is slow (dialup), that may be the function, coupled beside the first answer. Try downloading it, and afterwards first performance it from your computer
3. How much RAM is on your computer? A small or moderate amount of RAM will impose PDF files to unseal even more slowly.
I suggest downloading it to your computer, afterwards hole it from here, and walking away for a while. Hopefully it will be unscrew when you come vertebrae.