PDF opens in the TWINUI default app

And I hate it. A PDF file that I have used before (under Adobe Reader/Windows 7) is useless. It is a form that could be filled in and printed. Now I have to print the form (TWINUI) (ctrl + p) and have to fill in by pen.

Is it advisable to download Adobe Reader and bypass the mess of TWINUI? If so, how would I disble this app and use Adobe reader as default?

Tech Support Guy System Info Utility version 1.0.0.2
OS Version: Microsoft Windows 8.1 with Bing, 64 bit
Processor: AMD E1-2500 APU with Radeon(TM) HD Graphics, AMD64 Family 22 Model 0 Stepping 1
Processor Count: 2
RAM: 3517 Mb
Graphics Card: AMD Radeon HD 8240, 512 Mb
Hard Drives: C: Total - 461023 MB, Free - 413172 MB; D: Total - 14398 MB, Free - 1826 MB;
Motherboard: Hewlett-Packard, 2AFE
Antivirus: Windows Defender, Disabled