MDT Headache

Hello Spicepeople!

I'm asking this question here because it's giving me a major headache and been trying to solve it for the last 3/4 days.

I have around 150+ Dell 2120 Netbooks that I need to re-image. I have an issue where alot of them will not connect to the deployment share and wont get the the MDT litetouch Welcome Screen. But some of them will. Sometimes one that refuses to, will work later. Its a lottery.

I get the famous, 'Connection to the deployment share could not be made, Connection OK, Possible cause Invalid Credentials'.

I have the NIC drivers added to the WinPE and I have updated the deployment share. I have also updated the boot Image in WDS.

All of the other computers (over 800 of them) will connect fine and boot into WinPE and happily deploy their image.

Any Ideas please, before I explode.