Can't delete worms due to Admin. sign on

My computor was slowing down, so I ran a series of programs - malware, spyware etc. Each showed a variety of worms, trojans etc. I tried to delete them but I couldn't delete them because it says the "administator" has to be the one to do this. I AM THE ADMINISTRATOR.. I've logged out, re logged in-nothing works. What do I do?

Try booting to safemode and run malware, spyware again, you can boot to safemode by tapping on F8 while your pc is staring up and then delete worms, trojans.

Thanks- I never had a password on my admin acct- just added one- hoping that will help- plus I just found this 'eyechart' to check to see if you are infected with the Conficker Virus, and it seems that I may be infected with that-I "right clicked" on my spy ware and the open came up to 'sign on as admin' It didn't ask me for my pass word which leads me to believe I may still not be signed in as admin- but if that doesn't work I'll try your suggestion next- Thanks!