[phyrrus9]

i think it must be handled by a computer technician!

I don't know what you mean by that. a "computer technician" is often some guy with a high school GED who works for $8/hr installing antivirus software on uninformed people's computers. It's pretty easy to clear CMOS, it's just an EEPROM. Most operating systems even include support for this. For example, you can do this in windows with

Code:

debug
-o 70 10
-o 71 aa
-q

I thought it would be very tough becoz messing with cmos and bios can be very bad!
Sorry anyway,
Thank you very much!

As long as you know what you're doing it'd not going to hurt anything. BIOS programs are usually designed to be idiotproof anyways. If you fuck it up you just yank the latch battery and start over.