So often we receive computers that are so infected that they are no longer bootable (or won't startup). If your system is suddenly running slow, and you have the most popular anti-virus programs (no names will be mentioned here, but you have a good idea what they are), there is a good chance you have spyware, malware and trojans infecting your system.
Malicious software in your system causes programs to act sluggish and also slows down other programs. Many times without being checked these hurtful programs can eventually corrupt your boot record and cause a system failure.

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