Yuor problem will not be solved by trying to access Safe mode and deletin the entries
Run a scan with a good AV sw - I suggest KAV or NOD32 [trial versions will do]
once the computer is rid of all the viruses/malwares...... the autorun problem will be solved
but since Task manager disabling is not such an illegeal operation, it
may not recitfy itself.
So in order to re-enable Task Manager go throught this post
All Kinds of Restrictions for Windows 2000, XP, 2003 and Vista
Just look at point
14)
and since you want to
enable and not disable Task Manager just change the value to
0 instead of 1 as is mentioned
once these are done your problems should be solved - then try accesin safe mode