Ransomeware

my system attacked by the ransomware malware and all of system files encrypted by the virus and they left the .txt note with ransom of $500 bitcoin currency to provide the tool so recover my all data. i have very important data which is encrypted/locked with extensions .lockbit .roger .pandemic...

Please help me i can't find a solution it's suicidal 😭 😭 note my desktop is running on windows 7(i don't use it much and it has not been updated since ages) I switched on my desktop after 5-6 months and found that my system was attacked by ransomware virus most of my files pictures documents...

today i've notice a very transparent tiny gray dot on my led screen, i thought it was stuck dust, tried to remove it but it won't come off, other dusty spots around it came off though. i don't know if its a dead pixel or just a sticky dust?, it doesn't look like a dead pixel for what i know...

I would like to know know how much my 2009 toshiba satellite A505D S6968 worth?