Lion 10.7.4 Finder no longer working

Question

Hi all
I am posting here as a last resort and i have looked at all the posts i could find on this and still no joy. I will outline what i have done to date below and hopefully someone here can help.
The problem
Logged off two days ago and when i logged back in, whenever I tried to open finder to look at any drives, either internal/ external or files it just hangs with a "not responding". I didnt do any updates during the period on any software
Also programs like Itunes also hang with a not responding and dont seem . So i thought Firewall? Permissions? Hardware? Lion problem, User account config problem?. One other wierd thing that happens is the ethernet server connection keeps resetting. I can access the internet via web browser and software updates are fine. Firewall is open.
I have not updated software to 10.7.5 as i dont think it will solve the problem
So far i have done the following.
Disk repair/permissions etc - All ok
Disk repair /Permissions etc from install disk - all ok
Checked admin user and harddrive permissions and couldnt see anything there
Safe boot start up - Problem is not there and seems fine - So assumed user config issue or software
Hardware Check (Just in case) - All Ram OK disk images ok. Graphic card ok
Guest Account- logged in and problem exists.
Deleted user account started a new one- Problem exists
PRAM reset-  problem still there
Rolled back to earlier version from Time machine - Problem still there
Reinstalled Lion from backup HD and problem still there.
I have not deleted Plists yet as im a bit hesitant but not sure if thats the problem
So as you can see appart from multi wiping the HD and a complete reinstall im running out of options and i was really wondering if anyone here could help
System details are as follows
Running Lion 10.7.4
Model Name:
Mac Pro
  Model Identifier:
MacPro1,1
  Processor Name:
Dual-Core Intel Xeon
  Processor Speed:
2.66 GHz
  Number of Processors:
2
  Total Number of Cores:
4
  L2 Cache (per Processor):
4 MB
  Memory:
7 GB
  Bus Speed:
1.33 GHz
  Boot ROM Version:
MP11.005C.B08
  SMC Version (system):
1.7f10
  Serial Number (system):
  Hardware UUID:
00000000-0000-1000-8000-0017F20E1906
HD details
Vendor:
Intel
  Product:
ESB2 AHCI
  Link Speed:
3 Gigabit
  Negotiated Link Speed:
3 Gigabit
  Description:
AHCI Version 1.10 Supported
Hitachi HDP725050GLA380:
  Capacity:
500.11 GB (500,107,862,016 bytes)
  Model:
Hitachi HDP725050GLA380            
  Revision:
GM4OA52A
  Serial Number:
xxxxxxxxxxxxxxxxxx
  Native Command Queuing:
Yes
  Queue Depth:
32
  Removable Media:
No
  Detachable Drive:
No
  BSD Name:
disk0
  Rotational Rate:
7200
  Medium Type:
Rotational
  Bay Name:
Bay 1
  Partition Map Type:
GPT (GUID Partition Table)
  S.M.A.R.T. status:
Verified
  Volumes:
disk0s1:
  Capacity:
209.7 MB (209,715,200 bytes)
  BSD Name:
disk0s1
  Content:
EFI
Disk 1- Operating system:
  Capacity:
499.25 GB (499,248,103,424 bytes)
  Available:
78.15 GB (78,149,066,752 bytes)
  Writable:
Yes
  File System:
Journaled HFS+
  BSD Name:
disk0s2
  Mount Point:
  Content:
Apple_HFS
Recovery HD:
  Capacity:
650 MB (650,002,432 bytes)
  BSD Name:
disk0s3
  Content:
Apple_Boot

Answer 1

Ok a quick update after spending a bit more time on this and countless hours looking through the logs i think ive found out what the problem is
So deleting the Plists worked a dream and also reseting the permissions whilst in lion recovery mode also worked.
CMD R whilst start up, select utilities, open terminal & type in passwordreset. This will give you a screen but dont change any passwords. Just go to the bottom and reset the folder permisions of the users.
However in resetting all of this and reinstalling lion there is somehow now another  problems when i now try and access my NAS folder im getting these logs with MDS running hot but im not clear why spotlight is trying index an external NAS harddrive it would seem its creating probs with the Kernal but not sure , anyone else understand this better than me?
10/10/2012 23:07:04.054 mds: ERROR: _MDSChannelInitForAFP: AFPSendSpotLightRPC failed -1
10/10/2012 23:07:04.000 kernel: AFP_VFS afpfs_mount: /Volumes/Public, pid 433
10/10/2012 23:09:41.155 KernelEventAgent: tid 00000000 received event(s) VQ_NOTRESP (1)
10/10/2012 23:09:41.155 KernelEventAgent: tid 00000000 type 'afpfs', mounted on '/Volumes/Public', from 'afp_0SKHYc1S3fwZ1MzmOB000000-3.2e000003', not responding
10/10/2012 23:09:41.156 KernelEventAgent: tid 00000000 found 1 filesystem(s) with problem(s)
10/10/2012 23:09:41.000 kernel: ASP_TCP Disconnect: triggering reconnect by bumping reconnTrigger from curr value 0 on so 0x16a978b0
10/10/2012 23:09:41.000 kernel: AFP_VFS afpfs_DoReconnect started /Volumes/Public prevTrigger 0 currTrigger 1
10/10/2012 23:09:41.000 kernel: AFP_VFS afpfs_DoReconnect:  doing reconnect on /Volumes/Public
10/10/2012 23:09:41.000 kernel: AFP_VFS afpfs_DoReconnect:  posting to KEA EINPROGRESS for /Volumes/Public
10/10/2012 23:09:41.000 kernel: AFP_VFS afpfs_DoReconnect:  Max reconnect time: 30 secs, Connect timeout: 15 secs for /Volumes/Public
10/10/2012 23:09:41.000 kernel: AFP_VFS afpfs_DoReconnect:  connect to the server /Volumes/Public
10/10/2012 23:10:01.931 mdworker32: kCGErrorFailure: Set a breakpoint @ CGErrorBreakpoint() to catch errors as they are logged.
Time machine is not connected and is another drive. The  /volume/public is my NAS which i can access and connect to fine with a password but when i go to read the drive it has a fit and finder starts to "not respond" again locking up the programs.