I have just sent to AVG the results of what I was asked to do late yesterday eveing when trying to run Backup in WinRescueXP.
With AVG Internet Security 9.0 running, often, as now, the error message from WinRescueXP is Unable to write to C:\WINDOWS\r27.user.ini
With the Internet connection shut down, in turn I disabled Resident Shield, Link Scanner, Firewall and Web Shield in AVG IS 9.0. Each time the WinRescueXP Bacup was unsuccessful with first r27, then r28,r29 and finally r30 unable to be written to.
When I hear from AVG I will post again.