Since my last PC died I have been trying to keep my new PC clean and healthy.

Every week I have been doing the following things. Defragging, full anti virus scan and CCleaner (to delete unused registers).

Is there anything else I should be doing to keep my PC running faster?

Please tell me solution of this mesg. this mesg. appearing after 2 min. in windows xp desktop beside the Time. I have used many anti virus, and registry cleaner, anti malware, anti spyware, but this message not going. if i click this message then open a antispyware web site. please help me.. i am very confused, t will be very thankful to any body who give me proper solution.

CRITICAL SYSTEM ERROR ! SYSTEM detected virus activities, they may cause critical system failure,Please use antimalware software to clean and protect system from parasite program. click here to get available software

A Registry Mechanic (installed on my Desktop) scan showed 24 shared DLL’s, 75 Temporary/Shortcut and 14 Deep Scan problems/errors. Unfortunately, I’m not a computer nerd and so, I don’t know what all that stuff means. I haven’t purchased it (Registry Mechanic/PC Tools), yet. I don’t know what a computer "registry" is.

I’m also receiving prompts telling me I have both application and stop (and some other type of error I don’t remember) errors.

My computer’s security programs consist of the following freeware: Ad-Aware SE Personal; Spybot Search & Destroy, and SpywareBlaster for malware/anti-spyware purposes; and for a firewall, ZoneAlarm.

I have an unpurchased/not registered Spy Sweeper (Webroot) on my Desktop which I use for scan purposes.

My only registered/purchased (anti-virus) program is AVG Professional, from Czechoslovakia, and I’m in the last year of their two-year program. I have no big complaints about them. If there’s a better one, I’m not aware of it

HELP

I have a beautiful CD/DVD burning program, and it has been suggested to me that because I’m getting the message "Trial Period Is Expired", it’s very likely because an anti-virus program or Registry Cleaner is removing the program when it cleans. How do I list the exception in Norton’s Systemworks so it doesn’t clean the Registry thereby removing my program? I also have CC Cleaner, and can list the exception in there.
Must I ‘uncheck’ the windows registry scanner in the Systemworks?
When the Registry Cleaner is working, does it just clean, or does it correct errors?? I’m confused and would appreciate any help offered. Thanks in advance.

I already have one that comes with my anti-virus program but it’s not as effective as the one that I use to have. I want to use it again but I’m afraid it might conflict with my anti-virus’s cleaner. Is it ok to have 2?