In the group policy editor try:-
Click Start, Run, type gpedit.msc and click OK.
Navigate to...
User Configuration / Administrative Templates / System / Ctrl+Alt+Delete Options / Remove Task...

start menu, run, type taskmgr and click ok. Or right click on your taskbar at the bottom of the screen and select Tash Manager from the pop up

I would slipstream them with Nlite as you need to make sure they are the correct drivers for your system. Below is the link to the optiplex 330 dirvers, there are hard drive and storage matrix...

Are you using an origianl dell restore cd or a retail copy of XP. A retail copy will not have the sata drivers you need and will need them either slipstreamed or added as a third party driver from...

It can't write to memory block 0x00000010, either the block is reserved for an application or the block is bad. How many RAM sticks are there in your pc, can you take them out one at a time and...

I know it is only simple but have you checked the hdd cables. If you have a faulty cable on either hdd it might cause conflicts and system freeze?

Sounds similar to a hdd failiure I came across a...

Have you checked the raid/sata drivers? The standard XP cd does not contain raid drivers.
Also is it XP home or XP Pro, I once had a similar problem with XP Home. I was trying to set up raid and...