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sub scan_installed {
    system ('reg query HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\
+Uninstall /s > temp_instal.txt');
...
    close(INSTAL);
    system ('del temp_instal.txt');
}

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HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall
+\{AC76BA86-7AD7-1033-7B44-A80000000002}
    AuthorizedCDFPrefix    REG_SZ    
...
    Version    REG_DWORD    0x8000000
    Language    REG_DWORD    0x409
    DisplayName    REG_SZ    Adobe Reader 8