I've been dealing with this problem for a few days and i finally got it after looking over different forums form random websites they all work for some people but I'm gonna try to put them all together the best i can.
First of all I got this problem from a virus like I'm sure you did. The virus also turned off my "run" command. so while i'm here i'll tell you how to turn it back on. What you need to do to turn your run back on is this
Click Appearance and personalization.
Click Task bar and start menu
Go to start menu tab
Click customize (if you see a bunch of boxes already ignore this)
Scroll down and click the "run command" box to active then click ok
That SHOULD get you're run command back up.
Now one method to fix this problem is to do the following (keep up lol)
It will ask for admin rights, click yes
Click the pluses in this order....
HKEY_CURRENT_USER \ software \ Microsoft \ Windows \ CurrentVersion \ Policies\ System.
Then you should see "disable task manager" or something to that effect, simple double click or right click and click "modify" and turn the number to 0 (zero)
Another way that seemed to work well for others is simple open RUN and type in
REG add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /t REG_DWORD /d 0 /f
and that worked for some others, much easier but didn't work for me.
This SHOULD fix it, But unless you're like me and it DOESN'T work, there's another much simpler way.
Download and run Rkill.exe Now i know some people are like you don't know who i am this could be a trap but the download is on CNET downloads a well trusted site and good downloads. To tell you the truth i'm not 100% sure what Rkill does but I know it fixed this stupid problem. simply download the program here..
RKill - CNET Download.com
and run it, a black box will come up saying what it's doing..let it do its thing. Once it's done it MAY close something you have open..It won't effect it at all just re-open it but it is a possabilty. If these didn't work for you please contact me to make sure you did it right first and I'll gladly help you though it. I'll use teamviewer if i need to.
hope i helped internet peeps! i'm out.
Fear bunny productions