This time is not about viruses but I'm not sure if I should be more or less concerned for that reason.
Yesterday my computer was working fine and today after starting it I got the error:
A problem has been detected and windows has been shut down to prevent damage to your computer.
If this is the first time you've seen this Stop error screen, restart your computer. If this screen appears again, follow these steps:
The bios in this system is not fully ACPI compliant. Please contact your system vendor for an updated bios. If you are unable to obtain an updated bios or the latest bios supplied by your vendor is not ACPI compliant, you can turn off ACPI mode during text mode setup. To do this, simply press the F7 key when you are prompted to install storage drivers. The system will not notify you that the F7 key was pressed--it will silently disable ACPI and allow you to continue your installation.
I tried to start the Windows in 'Safe Mode' only or 'Last known good configuration' but I got the same blue screen every time.
The last thing I installed on my PC [yesterday] was the Wireless Adapter that I'm using to connect to Wireless Network from my main router in the other part of the building.
I don't know what should I do about this because I can't even start Windows to check what's 'inside'. So I guess I have to make some changes in the BIOS first.
Thanks a lot for your help,