pup.optional.install core.a belongs to the trojan horse family which may cause the computer system crashes in the end. read this passage and help yourself get rid of the virus completely.

1. Completely Get Rid of PUP.Optional.InstallCore.A
PUP.Optional.InstallCore.A is a malicious Trojan horse which will be a big
threat to the infected PC. It is recommended to remove this notorious virus
immediately once you have noticed its existence on your computer. When
PUP.Optional.InstallCore.A sneaks into to the computer, it will cause a
bunch of PC issues. The homepage and default search engine may be
changed by the virus and some strange icons and shortcuts are added on the
desktop or bookmark. These icon and shortcuts are always related to the
commercial websites or pornographic contents. Once you have clicked them,
you may be navigated to the malicious webpage and open a chance for other
computer virus to invade into the compromised PC. Meanwhile, users may
experience gradually slow running speed as this Trojan horse has filled up
the hard disk space with unwanted malicious items and consumes a lot of
CPU memory. What’s worse, PUP.Optional.InstallCore.A has the ability of
key logger. The privacy security will be threatened by this notorious Trojan
virus as it can help cyber criminals collect valuable information out of the
infected computers. In a word, you cannot leave PUP.Optional.InstallCore.A
stays on your PC any longer; otherwise, you may encounter system crashes
in the end.
How to remove PUP.Optional.InstallCore.A completely from the infected
computer? Many users have tied to remove it with antivirus software;
however, this virus appears again after the PC restarts. It seems that only
rely on antivirus scan cannot help users to completely clean
PUP.Optional.InstallCore.A. At this time, manual removal is needed to
delete all the infected files, registries and processes in case
PUP.Optional.InstallCore.A would reproduce itself via any left files.
Manual removal guide:
First: stop all processes that related to PUP.Optional.InstallCore.A.
Concrete steps
1). Open task manager by pressing Alt+Ctrl+Del keys at the same time.
Another way is to click on the Start button and choose Run option, then
type taskmgr into and press OK.

2. 2).Terminate all the processes about PUP.Optional.InstallCore.A in the
Window Task Manager.

3. Second: show hidden files and folders.
Concrete steps
1).click the Start button and choose Control Panel, clicking Appearance
and Personalization, to find Folder Options then double-click on it.

4. 2).in the pop-up dialog box, click the View tab and uncheck Hide protected
operating system files (Recommended).

5. 3).delete all the files about PUP.Optional.InstallCore.A from computer drive
%Windows%system32[rnd].
C:windowssystem32services.exernd
C:Windowswinsxsamd64_microsoft-windows-none_2b54b20ee6fa07b1””
Third: delete all registries created by PUP.Optional.InstallCore.A
Concrete steps

6. 1).open Registry Editor by pressing Window+R keys together.(another way
is clicking on the Start button and choosing Run option, then typing into
Regedit and pressing Enter. )
2). locate all registries that added by PUP.Optional.InstallCore.A and delete
all of them.

7. HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionU
ninstallPUP.Optional.OpenCandyShortcutPath “%AppData%[RANDOM
CHARACTERS][RANDOM CHARACTERS].exe” -u
HKCUSOFTWAREMicrosoftWindowsCurrentVersionRunRegedit
HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionP
oliciesSystem “DisableRegedit”
Note: If you cannot fulfill the removal instruction as below or have any
question about the steps, you are welcome to contact Tee Support 24/7
online computer experts (www.teesupport.com) for help.