When i did a anti-virus run there was this: Trojan. Dropper Agent-134 found 3-times.It was found in A1 Ultra PC Cleaner, Reg Vac. registry cleaner and in Speed start up. Are these necessary for the programs or should i delete the programs and reinstall them. Greetings

   That trojan has nothing to do with our programs.  This is the first time I have heard of it.  I did a search for it on the internet and did not find very much information about it.
   Sometimes viruses will attach themselves to programs that you run and so that may be why they have infected our programs.
   Another possibility is that your anti-virus program is wrong and that our programs have nothing wrong with them.  Webroot's SpySweeper has wrongly detected our programs in the past.
   You should be able to delete those programs and reinstall them.