i am using windows7 only, when am trying to download some 20 pdf files, i was suceeded only for 5 to 6 files(both in IE n Mozilla firefox).. when i try

i am using windows7 only, when am trying to download some 20 pdf files, i was suceeded only for 5 to 6 files(both in IE n Mozilla firefox)..
when i try to download the remaining files,acrobat reader displays an error..
what might be the problem?
any solutions to solve this problem..

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