This error can be caused by the following conditions:
Your hard drive or floppy drive has a corrupt section (damaged track or sector).
A temporary operating system or network failure has occurred.
Your network is unavailable, slow, or is corrupting data packets (failure of a router, network card, or noise on the network transmission line).
Your antivirus program may be causing problems accessing certain files.
In the case of a damaged disk, you must save the file to another location (for example, a different drive).
In the case of a failure of the operating system, this can be caused by various memory management problems, viruses, incorrect usage of a UNC, alias, or invalid perimissions to the share where the file is stored.
If the network is experiencing problems, it is usually a temporary condition and if you wait a short period of time and try again, you can usually save the file. If the problem persists, consult your network administrator.
A known condition with an antivirus program can cause a similar condition. Check with the manufacturer of your antivirus program to see if an update exists.