Hello:  I am new to the forum.  Yesterday, I gave my computer maintenance.  I did the usual . . . antivirus and spyware scans, deleted old emails, deleted temp files, etc.  I found several trojans and something else, so I gave the command to remove them.  Then I did a disk cleanup.  Then I started the defrag and an error came up "Disk Defragmenter Could Not Open.  I have a Dell Dimensions 2400 with Windows XP Home Edition Service Pack 3.  Then I started a search to see how to fix the problem.  I noticed when I clicked on a link, it took me to an entirely different web page.  I clicked the "back" button, but the site wouldn't go away.  I had to click back in the search box to get Google again.  I found some forums that said do a dskchk and I did (with the instructions) I'm not a technical person; but I can follow written instructions.  Then I did something that told me to check the paging file size; I did that.  Something else said to check for a dirty file; I did that.  Nothing has worked.  Is there anyone who can help me?  Someone said to do a system restore; but I'm concerned about all the windows updates, antivirus updates, and antispy updates that are on my system.  Won't they go away?  Is there a way to get them back?  When I removed the viruses, did I remove something that may have been okay?  This has never happened before and I don't know what to do.