A month ago that laptop was completely destroyed ,forever !
That's not really an issue... as long as you have your 24 words, you'll be able to recover whatever coins are being managed by your Ledger device. All the keys necessary are able to be restored from your 24 words, so regardless of whether or not your laptop/PC or Ledger device are functioning, you can recover.
I just now downloaded the Ledger app
...
It is now downloaded onto my PC . But my Ledger doesn't recognize it .
...
I unplugged the Ledger several times ,but still the same.
As bob123 is theorising... It sounds like your Ledger device is not being recognised by Windows correctly.
When you connect the device
and then unlock it with your PIN, do you get the the USB device connected "bing bong" sound?
If not, then there is either an issue with the USB cable you are using (no data, only power?)... or there is some sort of issue with the USB device driver install.
If you've tried a different cable (that you know allows you to transfer data and isn't just a power cable from a phone charger etc), you may need to go into Windows Device Manager and see if you can see a device with a little yellow triangle and ! mark. Right click on the device and then "uninstall device". Then disconnect your Ledger, and then reconnect it
and unlock it with your PIN again.
See if it then gives the "bing bong" sound and shows up in Device Manager as "Nano S" under "Universal Serial Bus devices":
If it does, then you should be able to see the device in Ledger Live... open Ledger Live and away you go.
Right after downloading the app ,my ledger said " Vires in numeris " ,but it disappeared . And I'm wondering if s that mean virus or something ?
Any help will be appereciated .
That is basically a "screen saver" on the device... it'll scroll along after an "Auto-lock timeout" (which you can adjust on the device in "Settings -> Security -> Auto-lock").