BleepingComputer.com: Is it ok to delete EISA Configuration partition?

is it ok?

Probably not. Most likely it contains either boot information or recovery information for your system.
Should you decide to delete it anyway, be sure to have your data backed up and your restore disks handy.

Thanks for the reply.

I am using Vista Home and my laptop model is Acer Aspire 5920G.

I have already perform factory default backup of my Acer laptop using Acer eRecovery which supposedly return my OS to the point when I first bought it. Is that enough?

The reason I need to delete the EISA partition is that it uses up two of my partitions as primary partitions leaving me no extra primary partition left to install a Linux. The other two are C: and D: which are both NTFS primary partitions and both are about 2/3 full.

The EISA partition shouldn't be all that big, so formatting it may not give you enough space anyway.
The backup disks should enable you to restore the computer - but do you know that the disks are good? I've had experiences where I've made backups and they couldn't be restored. The only sure way to know this is to actually do a restore with them.

Also, disks can deteriorate over time - so in the future they may not be usable. In that case you'll have to contact Acer for a replacement set (I don't know how much they cost).

Finally, I don't know the exact contents of the EISA partition - so deleting it could cause the system not to boot to Windows. Then you'll have to repair it using the restore disks anyway.

As I recall, the D: partition is for storing data. As such, your easiest option would be to transfer the stuff off of the D: drive onto an external drive. That way you can use the free space in the D: drive (and won't have to take the chance of borking the boot up process).

I think I'm going to try and delete them and see what happens.

Anyway, many thanks for your support:)