I recently installed some character and clothes overhauls for Fallout new Vegas, they were installed manually and then moved to nexus mod manager. There were no problems in installation and no messages appeared saying anything was wrong. I try to load the game up and it automatically freezes and turns itself off. I can't even get onto the menu, I then tried installing New Vegas script extender just to see if it might help but still no joy. Any help would be greatly appreciated thank you.

Which mods did you install? Please post a load order.

Did you sort your mods with https://code.google.com/p/better-oblivion-sorting-software/downloads/list after you installed them?

Did you read the documentation for your mods to get information on proper installation procedures, known conflicts, and other necessary files?

Not to mention the need for Merged Leveled lists among other things. This is done in Wrye Flash. Also, did you toggle the Archive Invalidation? You can do that in FOMM or NMM.

FalloutNV.esm
FCO Master.esm
FCO - FOOK-PN Convergence FCO.esp
FCO - FOOK Patch.esp
FCO - OnHolyServiceBound NPC's.esp
FCO - Roberts Patch.esp
FCO.esp
Pipboy2500.esp

That is the exact order what they are in at the plugin section on Nexus. They are the only mods I am using.

You've got a couple of patches there for FOOK and PN , but I don't see FOOK or the PN mod files themselves. If you're not running either of those mods, disable those patches. Your game's crashing because the patches can't find the master files for those mods.

ETA - if you're not using the Roberts male body replacer, disable that patch file as well.