Windows 98 error message - real mode system memory allocation failed

[colandsuey]

Help!
My PC was booting up ok then came to a stop with this message displayed - "While initializing device IOS. Error: Real mode system memory allocation failed" - wouldn't carry on to load Windows 98SE.
It will boot up to Safe mode but not to normal.
To get around the problem I have restored previous registries the past few times I have switched on, but have now run out of good ones!
I've tried googling for answers but none really helped.
Can anyone please tell me what may have caused this and what I can do?
Many thanks.

[sparkyharky]

Try renaming c:\Windows\system\iosubsys\RMM.PDR to something like RMM.PDR.old

Restart and see if it works now.

RMM.PDR facilitates some real mode calls from MSDOS which are seldom if ever used, even in the days of MSDOS!

[colandsuey]

Thanks sparkyharky - I followed that advice and all now seems ok, PC boots up without any probs - many thanks!