Access violation error while running setuo

I had created an Address Book application in Visual Basic and with the help of Package and Deployment wizard I had created setup files. Then I tried to install the applicatin on my office machine, every thing was well until I got an error message box saying,
"C:\Windows\System\MSVCRT.dll" An access violation occured while copying the file.
It gave three options ABORT, RETRY, IGNORE. First I tried retry command and then I said Ignore, it gave one more message box saying,
"If you ignore a copy error, the file will not be copied. The application may not function properlyas a result. Do you want to ignore the error?"
I said Yes and it installed all remaining application. After that I ran the applicatin and it worked properly. Can you tell me what the error about MSVCRT.dll an access violation ment and how can i get rid of the error?