SYMPTOMS

[Various error messages when trying to save files in Office, Paint, Adobe PageMaker 7.0, and other applications]

CAUSE
These issues may occur for the following reasons:
A non-Microsoft application that is installed on your computer uses an outdated kernel-mode filter driver.
A third-party file system filter driver interferes with other filter drivers.
The VERITAS Backup Exec Advanced Open File Option (Vsp.sys filter driver) is loaded in combination with an antivirus filter driver, such as one of the following Symantec AntiVirus Corporate Edition 8.0 filter drivers:
Symevent.sys (Symantec Event Library)
Navap.sys (Symantec AutoProtect)
The file that causes this issue is systemroot\system32\drivers\vsp.sys.

[There is a resoulution and workarounds provided in the article]