Yes, you can download multiple anti-viruses with no problem although you don't usually need to. They can bog down your computer if you have numerous applicaitons scanning your drives at the same time, etc.
If you are looking for something free...there are decent options out there like basic ZoneAlarm and some others.
If you don't mind paying for it, Symantec's Norton Anti-Virus and Internet Sercurity Suite is what I use. They are very good and constantly update their virus definition files.
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Slow performance can be from many different problems. The keyboard may be fine but the PC may have a problem. Except for a wireless keyboard which may have a low battery or obstructed receiver problem.
First go to START / Programs / System Tools / System Restore. Select SET RESTORE POINT and give it a name. This will let you restore your system to the current condition if anything goes wrong.
Try downloading "CCleaner" from www.download.com (it's FREE). Install it and let it clean up your Windows and your Registry. (You might de-select Cookies option to preserve your logins saved on your Internet browser) It will offer to save original Registry before cleaning it up. In most cases this will resolve slow performance from outdated Windows instructions and Registry errors.
Next go to My Computer / Right click on C drive (boot drive) and select Properties. Go to Tools and select Defrag Drive. If problem is serious you should also run Check Disk and select to make automatic repairs. These programs will take some time to run.
If the problem still persists, update and run your Anti-Virus software. If you do not have Anti-Virus software go to www.download.com and select AVG Free from the right hand column. This is a very good Free Anti-Virus software.
Disclaimer: The programs I recommend are suggested because they are free and very easy for the computer novice to use. I have no financial interest in these programs. I recommend and use these programs in my computer repair business.
First thing to try is replacing the batteries in your keyboard etc.
second is to update the drivers from this link;
However, this sounds like it could be a virus, not anything to do with your keyboard.
Check your anti virus software is up to date and do a full scan.
If you need good free anti virus software then go to;
To verify this it also would be worth plugging a standard keyboard into your machine and removing the drivers for your cordless one to see if you get the same problem.
Hope this helps, please ask again if not :)
if you are using the Wireless Keyboard, then try to change the Batteries. Many times when the Batteries get weak this type of keyboard issues while typing occurs. So try to insert new batteries and check whether the problem is recurring. If it is coming again then it is the Hardware fault.
This can also happen because of the Virus. There are some virus or spyware that are the causes of this issue. So I would like to suggest you to scan your system using the updated Anti Virus. Once the Virus gets removed that are causing this issue than problem will get fixed up. Don't forget that your Anti Virus should me latest with proper updates. Simple way to check that your Keyboard is working properly, by connecting to some other system. If the same problem is coming that means there is an Keyboard issue and you will have to change the keyboard. And if your keyboard is working properly on another system that means there is fault in your system. Then try to scan your machine with the Anti Virus. Doing this will exactly know you what was the issue and you can troubleshoot that.
if PS2 port was having some issue, that was lead to missed and repeated letters on the keyboard. Hope that you are not having any PS2 issues because then you will have to fix your motherboard.
first you had to identify the cause in your pc by connecting it to other systems and then proceed to fix the cause REGUARDS
Go to http://xviruslab.blogspot.com, and download Quick Heal Total Security (PC Mobile Scan and Data Theft Protection, Anti Phishing) or Quick Heal Anti Virus Plus, mail me if you're facing any problem.
Removing the existing driver and reinstalling it using a "clean-boot" may resolve the problems you are experiencing. Booting clean is a way to eliminate programs from conflicting with installation of software. Firstly, go to the manufacturer's website and download the latest version of your software/driver. Although you may have the latest version already, it could be corrupted.
Once you have done this, uninstall the existing driver using the add/remove software section in the control panel. Now restart your computer.
Once you have saved the correct software, it is time to "clean boot"
your computer. This will ensure no other conflicting software remnant
or anti-virus firewall can prohibit the proper installation of your software. I am assuming you are using XP. If not, just let me know and I will provide instructions for your particular OS..
1. Click Start --> Run --> Type MSCONFIG --> Click OK 2. On the General tab, choose Selective Startup 3. Uncheck Process SYSTEM.INI file 4. Uncheck Process WIN.INI file 5. Uncheck Load Startup Items 6. Click on the Services tab 7. At the bottom, check Hide All Microsoft Services 8. Uncheck all boxes in the window or click the button labeled Disable All 6. Click OK 7. Click Restart
Now you can reinstall the downloaded driver. Now do the following:
1. Click Start --> Run --> Type MSCONFIG--> Click OK 2. Replace the checkmarks you previously removed during the "clean boot" process. 3. On the General tab, choose Normal Startup 4. Click OK 5. Click YES, when asked to restart your computer
Hopefully this should resolve the issue. Please let me know how it goes...
System restores don't work too well. The virus/trojan has usually embedded itself beyond the restore, you're free to try it, however.
If it doesn't work, I would suggest some anti-virus/spyware scanning software. Here are two, one for viruses/vulnerabilities/some spyware and one dedicated to spyware. Both are absolutely free.
http://housecall.trendmicro.com runs from your web browser (I would suggest using Internet Explorer).
http://www.download.com/3405-8022-5153545.html?part=dl-ad-aware&subj=dl&tag=top5 This is Ad-aware, it will remove the spyware on your computer. This one needs to be downloaded.
If those do not work, then you have two choices: reformat the HDD (low-level format in some cases), or take it to a professional who can save your data and remove the trojan successfully.
Additionally, you can try Googling the trojan by its name and you'll usually find removal instructions. Symantec and Microsoft have the most accurate methods.