Hi,
This is chandu and willing to ask one question,if run command is disappeared due to trojans how to find and remove the trojan.
With thanks
Chandu

Go to SAFE MODE with networking -- run a scan with these programs -- How To Get Into Safe Mode (http://www.computerhope.com/issues/chsafe.htm)

BitDefender Online Scanner - Free Online Virus Scan (http://www.bitdefender.com/scan8/ie.html)

The home of Spybot-S&D! (http://www.safer-networking.org/index2.html)

Trend Micro HouseCall - Free Online Virus and Spyware Scan - Trend Micro USA (http://housecall.trendmicro.com/)

Also use this program to get rid of junk

Download CCleaner 2.05.555 - filehippo.com (http://www.filehippo.com/download_ccleaner/)

Download Latest Version Of Ccleaner and run it

Sometimes I have seen that some times due to some file corruption it happens,if it's a virus and you hae detected it then it fine otherwise you can download RRT(restriction removal tool) from softpedia.com and run it and follow the command what it says... and do keep in touch...

Open C:\windows\system32\gpedit.msc
Local Computer Policy -->User Configuration-->Administrative Templates --> Start Menu & Task Bar --> Remove Run Menu from Start menu --> Right Click --> property -->Disabled