I have been unable to open pdf files with reader x 10 & 9.4, they both just give me a blank screen. I am using windows 7 with a AMD athlon IIx4 processor not an Intel precessor. This problem started when I installed reader x 10, and I tried unstalling and also installing reader 9.4 and still have the problem. There is never a error message just the blank screen. I would appreciate some help in correcting this problem.