|Spyware Doctor is a legitimate anti-spyware progam made by PCTools. It's an okay program, but you have to pay for it in order to remove what it finds when it scans your computer. |
You (or someone else that uses your computer) would have had to have given permision for it to be loaded on your computer - it does not load itself without someone's permission. If you (or someone else) have loaded it, it is listed in Control Panel - Add Remove Programs. You can un-install it there. However, if you (or someone else) did not un-install it properly, such as if you deleted files for it rather than un-installing it, it may not un-install until after it has been installed again.
"....computer will not open programs... "
"...doctor/unins000.msg missing or rundll32.exe application not found?"
It sounds like you have more things going on than just a spyware doctor file is reported to be missing. It's not normal for you to not be able to open lots of programs , or for you to get a message that rundll32.exe is missing, which is an essential windows file.
See this to see if you have similar symptoms - if you do, try running Malwarebytes.
See Response 4 - probable "Rogue" anti-malware crap was installed - try using Malwarebytes.
If you DO have that, they have been known to sometimes disable other anti-malware programs from running. (Spyware Doctor is often set to scan your computer once a day when you have installed it.)