Computer very slow, freezes and dumps.
I thought this was probably the best forum (beginners) to post my question. Any help will be greatly appreciated. Keeping in mind that I may not easily understand computer jargon, so bear with me please. :)
My computer isn't exactly new, and in fact bought for me by my brother from a second hand shop actually, about 2 yrs ago. He cleaned it all up for me, and it worked just fine for what I need it for. Well it is very finicky! I will go for weeks with it working as it should, and out of the blue (and without doing anything new or different) I can barely get onto the internet. It takes a good 10 minutes for my screen saver to even show up, and then sometimes my msn, and toolbar shows up all in black. I've also had a black figure show up in my tool bar. Then all of a sudden, for no apparent reason, my computer works like a charm again for an unspecific ammt of time. It's hot and cold.
Last month, my Dad, who works on computers all of the time, came and reinstalled my virus protection and other things, because they had uninstalled themselves. About 3 days after he reinstalled, they disappeared again, or just won't work period.
I have:
Avast: Free version
Threatfire: Free version (and the only one that hasn't been uninstalled, and seems to work)
Ad-aware
Spy Dr.
Ad-watch
Reg. Mech.
I was told to do all of the scans I could do, and a defrag. The first time I did a Defrag. it worked great after that. Now when I do one, it seems to slow my computer down!
Also, I can no longer send anything from my Outlook Express, and my Adobe Reader will not function either.
I am not able to take my computer in to get a good clean-up right now, so any tips, and advice on why my computer runs like a charm one week, and then just sticks it's tongue out at me the next, is greatly appreciated.
Thanks all! :)