Failed to remove Print Provider

The data area passed to a system call is too small.

Error Code: 0000007A
RemovePrintProvider - DeletePrintProvider failed 122

And versions of the same message.

iprint client 5.32 and 5.40, same result. Installs ok, but never shows in taskbar, and does not detect in FF or IE to install printers.

Windows 7 64 Enterprise.

We are seeing the problem on a few notebooks... and the rest seems ok, all same day imaged machines.

Any help would be great.