Norton Utilities 3.0 using W95 can't update virus definitions.

I know it is old, but I have been able to update virus definations until the last attempt.

using 20100714-002-i32.exe.   My wife's computer, won't listen to thoughts of a new one.

When I try to update I get:  "Problem verifying files from archive. You may be out of disk

space or the files may be marked read-only.  Continue?"  I say yes, but NU says still

not up to date.  Lots of disk space left, don't know WHAT files might be marked read-only,

not the update file. Any thoughts about fixing this antique? THANKS!