maximum file upload size problem

[nuTTTz]

Apologies, a search did not provide what I was looking for.

We are using VB version 4.0.7 with Z-series red theme.

We are currently able to upload small zip files, 1 or 2 megabytes, but have problems with larger files.
When trying to upload a larger file of 50 or 60 megabytes we get an error saying the file is too large.
I have gone through every possible relevant setting in the CP, using 0's for unlimited and using values as high as 9999999999, but cannot get past this error.

Any help with this particular issue would be greatly apprecieated.

TY
nuTTTz