David, there should be 4 slots if memory has to work in dual channel mode. Yes & No. Your 512 MB would be running in dual channel, but 1 GB...
This option is driver specific & all the drivers do not give you this option. The better way is to load the driver on all the machines individually.
Every computer (whether XP or 98) must have the correct printer driver installed in order to print. It doesn't matter where the physical printer...
That's the user account created by Microsoft .NET. You can leave it alone.
First of all cleanup all the garbage from temp folder(s) & run chkdsk /r on all partitions on hard disk to eliminate any hard disk problem.
Separate names with a comma.