Task Manager,Regedit and safemode disabled

[Sajid1974]

Dear Sir,
From Last three days I am trying to resolve issue with my operating system the problem is explained below
My TaskManager is Disabled I tried to access regedit but it says regedit is disabled by your administrator I tried to change settings in Gpedit for making me enable to access regedit but its of no use I tried to bring computer in safe mode but it is not accessing safe mode.
I tried to third party s/w reg manager to access my registry files but if i change key values it is working for a moment only and again some thing is changing the registery I dont know what is running behind.
please help me to resolve this issue during the period of last three day my system is facing problems with other s/w such as ms office etc are giving errors
I found when I use PC for three-Four hours the screen are displayed with data missing on it some times when i click start program it shows empty.
I found you site is expert and experienced in resolving such issues waiting for your reply.
regards
Sajid

[amateur]

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