I have Compaq Armada (portable)

After instaling aditional software , a got an Error massage :

While initializing device IOS :
Error : An I/O subsistem driver faild to load.
Either a file in the .\iosubsys subdirectory is corrupt, or the system is low on memory.

I replaced all files in .\iosubsys directory.

I did find a solution , but i had to format the drive and reinstal the system with restore CD .

Can any one have some sugestion , to fix these problem more quickly.