[64 bit] Can't run installer file for ATI driver.

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http://ubuntuforums.org – I found the driver I need for my particular sytem from ATI's website and DL'ed it. I have an Acer Aspire 5532 with an ATI Radeon HD 3200 graphics card. Whenever I run the command, "sh ./ati-driver-installer-10-2-x86.x86_64.run", it returns "sh: Can't open ./ati-driver-installer-10-2-x86.x86_64.run". I am in root and it should be the correct file. Any ideas? And to anyone who has this driver on the same system as mine, will this enable Advanced Desktop effects? That and games are the reasons I want this driver, I'm sure this graphics card is capable of the task, it's just a (Hardware)