Solve : Re Boot help?

I have win 7. 64 Bit Home and 4. GB of RAM and a 2. Core AMD Athlon 64. CPU.

I have two Accounts setup on the SYSTEM one Limited Account and one with Administrative Rights.

I can only switch USERS about 3. times what I meen is I can only go back and forth between the two Acounts 3. times.

When I TRY to swicth users on the 3. RD time the screen goes Blue and then the system Re Starts. Then it asks if I want to start the system Normaliy or if I want to start the system in Safe Mode.

I pick Normale and the system Loads ok and I can Log On.

And the system runs and works ok but like I say it only Re Start like this if I switch users more then 3. Times.

So I RAN   Command Prompt as Administrator then ran   chkdsk c: /F

It then ran the next time the system was Re Started and told me there was No Bad Files and there are 73 Prabmlems being Processed.

But this prablem still happens all the time if I switch between users more then 3. times.

So I updated my MailwareBytes and ran it and it can up clean. Then I ran an Update on my Avast Virus program and ran it and it came up clean.

Please help?
ThanksI have more information about when I try to switch between my 2. accounts more then 3. times and I get a blue screen.

It says.

A12MDD.D11
PAGE_FAULT_IN_NONPAGEED_AREA

And then the system restarts.

The only thing it says other then that is

IF YOU HAVE ADED NEW HARDWARE OR SOFTWARE TO THE SYSTEM PLEASE CONNTECT THE ADMINISTRATOR.

I have not changed anything or aded anything.

Please help thanksRun sfc.exe - http://www.bleepingcomputer.com/forums/topic43051.htmlI think I may be closer to finding out why my system Re Boots when I go between my 2. accounts more then 3. times.

I whent into the Performance Settings Tab and put a Dot in   Ajust System For Best Performance.
And every Box down the list it toock the check mark out of.

And then switched my system to Clasic Style.

I do not think this woould have that effect on the system but I wanted to ask?

And STEP 2.
I read on the web there is a File for   switching users
what is the name of this system file and how can I search for it to see if my system has it?I have looked on google for the file called   tsdiscon.exe   and it says this is used by the system and I think this may be what is going on.

I whent into contole pannle and turned on Show hidden system files and then did a search and I just found 2.

They both had the same path
c:\windows\winsxs\amd64

but ontop of the first one it found it had
tsdiscon.exe.uil

Now if this is a system file can I not put in my win7. Home CD and run a repair like they had in XP?

Where it would just copy system files back over or is this not one that it would copy over?Ok I found this web page
http://www.sevenforums.com/tutorials/61307-switch-user-shortcut-create.html

I am miss understanding what it says?

It starts by telling you win7.Basic/Home Premuime has Fast User Switching in it.

Then down the page it says if you have win7. Premiume you need a file to download.

Then it says you will need to Switch User account and go to the Log On screen and pick the ather account you want to Log On to if you do not have this Feature.

Ok I have win7. Home Premiume 64 Bit and I made 2. account and when I want to go the the other account I go to my Start Bottun then Switch User.

Then it brings me to the Log On screen and I pick the other account.

So if it did not have it why can I do this?

Like I say it just works for 3. time then goes Blue and Restarts??It would help if you followed my advice from earlier. It will check all the system files and attempt to repair them...What manufacturing brand and model is this computer and bluescreen error message?