Why would my computer run slower after a repair?

I had a Geek Squad repair to my computer under an extended warranty I bought (which turned out to be more of a “pay for repairs in advance,” but nevermind). My son cracked the screen. They should have replaced it and that’s pretty much all. It was relatively new-- about four months-- and running just fine. Since I got it back, it has been running slow and Mozilla FF has been freezing a lot. I tried running IE, and it didn’t freeze, but it was still slow. Everything, like Java and Flash is up-to-date. It’s running Win10, and it’s up-to-date, albeit, I did a restore to a date before the repair, and it didn’t help.

Supposedly, the repair guys “go over” the whole computer (it’s a laptop), and fix anything they think needs tinkering, and that’s part of the warranty deal. I wasn’t allowed to say “Replace the screen and leave everything else alone.”

However, I don’t really know what they could have done to make it run slowly. I’m annoyed enough to be about a day away from going to Best Buy and giving them an earful, but not quite there yet, because I don’t really know what to say. “It worked better before you fixed the screen” is pretty lame.

Anyone have any experience with this, either laptop repair or Geek Squad and have an idea of what they might have done, or neglected to do?

Bring up Task Manager and check processor and RAM usage.

If they ran a disk cleanup they might have deleted the search index and Windows bogs down a bit during reindexing.

Already did that. Seems normal.

This, I did not think of. Thanks.

Go to Start >> All Apps >> Windows System >> Control Panel >> Uninstall a Program. This lists the dates that programs were installed. I can hardly believe that they would be stupid enough to install something without the customer’s knowledge, but that gives you a way to check.

You can also check Windows Administrative Tools >> Event Viewer, if you’re so inclined.

I had a computer store (that is no longer in business) reinstall bloatware that I had removed when they did warranty work on a system. When I questioned it, the guy said the suite of programs was necessary for him to do his work. Maybe that was true, maybe not.