Malicious codes come in three basic formulas.Viruses are small programs that reproduce themselves for purpose of causing some damage.

Trojan Horses are disguised as gifts which may come as an attachment in your email.Once ran its purpose is to cause do harm to your system as well.

Then you may come in contact with does worms which cause damage by copying themselves over networks as wells as individual systems.These codes alters not just one system but several within a network.

After you enhance your knowledge of malicious code, know symptoms of an infected system.Strange PC behavior,an increase or decrease of data in a file, pop up messages,random graphics,and files being deleted are some symptoms of your system having a virus.

The best way to find and remove viruses is with installation popular anti virus software from Norton or McAfee.These programs readily identify infections as well as promptly remove them.

If you recently installed a program or application and know where it was installed,you may be in much better shape as for as correcting error. Here are common ways to correct problem of your computer not completely booting up or not booting up at all.

If your computer will not boot-up at all,hopefully you have made a good emergency boot disk. You can always make a windows startup disk by creating one from another computer running Windows 98 or Me.Perform following if your computer won't Boot-Up At All.

FIRST......Put your boot floppy disk in floppy drive and turn on PC.On some computers, you may have to access bios and select Boot priority to your A: drive.Save any changes and select "Start Computer without CDROM support" and press Enter.Once you are at A prompt,type dir c: and press enter.

If your programs and other files are present,try restoring your system Registry by following steps below.This may repair Windows,the Config. Sys and autoexec.bat files to where PC may boot up normally.When files are present,its a good indication of a good hard drive.

SECOND......To correct problem of your computer not booting up,type in "fdisk /mbr" and press Enter to restore your master boot record.Type "Scandisk C:" to check hard drive for errors that have occurred. You can also type "Sys C:" to hopefully restore files needed to boot up your computer.

THIRD......If above procedures fail to repair your computer,you can repeat first part of step one above and select "Start Computer With CDROM Support" re-install Windows.