My computer seems to has having viruses...?

there are a few processes in my computer suddenly bcum capital letter,such as LSASS.EXE,CSRSS.EXE,SMSS.EXE, and Explorer.EXE.....my computer will suddenly shutdown...i have scan with my up-to-date antivirus software,but find nothing...how to manually remove it??pls help...

My computer seems to has having viruses...?best antivirus software

These are actually names of valid Microsoft processes. There is some spyware/viruses that use the same name. If you manually remove the wrong one your operating system will have to be reinstalled.

Now would be a good time to back up your files.

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Securing a Personal Machine

http://safecomputing.umn.edu/studentchec...

OS Reinstallation vs. Virus Removal

http://safecomputing.umn.edu/guides/rebu...

If you follow all the following steps it should get rid of your problem and prevent future problems. All programs listed are free.

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Update your Full Time (Active) antivirus and run a full scan.

If you do not have active virus protection, install only one. All are excellent.

AVG Antivirus 7.5 Free Edition

http://free.grisoft.com/freeweb.php/doc/...

http://www.download.com/AVG-Anti-Virus-F...

or

Free antivirus - avast! 4 Home Edition

http://www.avast.com/eng/avast_4_home.ht...