Gah, it's dead, Jim

[Onkel Neal]

So, my folk's PC, a win7 desktop, seems to have a virus. No outward signs but it runs really slowly, you cannot open the Task Manager or McAfee. Any suggestions before I reformat?

[ikalugin]

Could be a hardware thing.

If you do - purge all of your external flashdrives/HDDs using an ARM or other non standard system. BIOS persistent viruses are like AIDS, you need to take measures.

[Catfish]

Ouch. Do you have a restore point you can go back to ?

[Rockin Robbins]

First thing I'd do is a Malwarebytes scan. It's so reliable you don't even have to look at what it found: say "kill it all" and be done with it. Run the scan and eradication twice. Then go to bleepingcomputer.com and download and run ADWcleaner. It's free and finds things that Malwarebytes won't. Reboot and I'll bet it runs faster.

You could type Windows-r and do and type "msconfig." you'll get "msconfig.exe" in the results box. Click on it. Then you can go to the startup programs tab to look for programs starting with the system. You're looking for ones that are unfamiliar or those you know you don't want. Google the unknowns to see what they are. You can disable them right there in msconfig.

If your antivirus has been running the chance of a virus is low. It's much more likely that adware/spyware is just clogging the works and once it's out of the way their system will run well again.

[Skybird]

Depending on age and how intensly the HD/system was used, I would consider to reformat the drive to kill the data (if it is sensible data, reformat and then also overwrite 3-5x), but to install on a new HD.

I once did all the installation combo and detailed FS installation and all those many addons I used, very time-consuming, took me two days - and one week later the HD broke down, this time for technical malfunctioning. The Bird was not amused.

Its no big money these days. If its older than 18-24 months, consider a new HD.

If you consider to "repair" or to "clean" the installation you suspect to be infested, the only advise you need to know, is this: once corrupted, always corrupted. You can never be certain if you only "repair" it.

[Skybird]

Originally Posted by Rockin Robbins

First thing I'd do is a Malwarebytes scan. It's so reliable you don't even have to look at what it found: say "kill it all"

That is irresponsible to advise, Robbins. MBAM is very good, yes - but not fail-safe. On very rare occasions it can produce false positives, though much more rarely than any AV suites I have ever used. And I use MBAM as long as I can remember. Two or three years ago they also messe dup people'S PCs by a terribly flawed update which made many people to reinstall.

You always have to have a very close look before hitting the "proceed"-button.

No security software is out there that you should trust blindly. Never. Even more so since today these security programs themselves get attacked to find entrance into the system. This turns them into a vulnerability themselves.

[Rockin Robbins]

A "very close look" means nothing to 99% of people. You're best off by trusting what Malwarebytes shows you. At worst you might someday have to reinstall something it gave a false positive on. That's a tiny price for security.

[ikalugin]

Originally Posted by Skybird

That is irresponsible to advise, Robbins. MBAM is very good, yes - but not fail-safe. On very rare occasions it can produce false positives, though much more rarely than any AV suites I have ever used. And I use MBAM as long as I can remember. Two or three years ago they also messe dup people'S PCs by a terribly flawed update which made many people to reinstall.

You always have to have a very close look before hitting the "proceed"-button.

No security software is out there that you should trust blindly. Never. Even more so since today these security programs themselves get attacked to find entrance into the system. This turns them into a vulnerability themselves.

that wont wipe out bios persistent payloads