Yes — what you’re describing **matches exactly the known “PC App Store” malware/adware** that hijacks the entire screen, blocks Task Manager, and demands credit‑card details. Multiple users report the same symptoms: full‑screen takeover, fake account creation prompt, inability to close it, and Task Manager being suppressed.   [Microsoft Learn](https://learn.microsoft.com/en-nz/answers/questions/5855783/pc-app-store-program)  [Microsoft Learn](https://learn.microsoft.com/en-us/answers/questions/4373669/how-to-block-persistent-pc-app-store-pop-up-on-win)  [Microsoft Learn](https://learn.microsoft.com/en-gb/answers/questions/5857899/how-do-i-get-rid-of-adware-pc-store-prevent-me-fro)

Below is a **precise, battle‑tested removal procedure** that works even when Task Manager is blocked. Follow the steps **in order** — this malware is stubborn, but it *can* be removed without reinstalling Windows.

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## **How to Remove the “PC App Store” Malware (Full‑Screen Lock Variant)**





Sources:   [Microsoft Learn](https://learn.microsoft.com/en-nz/answers/questions/5855783/pc-app-store-program)  [Microsoft Learn](https://learn.microsoft.com/en-us/answers/questions/4373669/how-to-block-persistent-pc-app-store-pop-up-on-win)  [Microsoft Learn](https://learn.microsoft.com/en-gb/answers/questions/5857899/how-do-i-get-rid-of-adware-pc-store-prevent-me-fro)

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## **Important Notes Based on Your Description**

- The **white background with a blue “U” icon** is consistent with variants of the same PC App Store adware family — users report different icons but identical behavior.
- The fact that **Task Manager won’t open** is a known symptom.   [Microsoft Learn](https://learn.microsoft.com/en-us/answers/questions/4373669/how-to-block-persistent-pc-app-store-pop-up-on-win)
- Logging in as Administrator does not help — the malware loads for all users.   [Microsoft Learn](https://learn.microsoft.com/en-us/answers/questions/4373669/how-to-block-persistent-pc-app-store-pop-up-on-win)
- Disconnecting the PC from the internet often prevents the popup from reloading long enough to uninstall it.   [Microsoft Learn](https://learn.microsoft.com/en-us/answers/questions/4373669/how-to-block-persistent-pc-app-store-pop-up-on-win)

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## **If all else fails**
A **System Restore from Safe Mode** reliably removes it when uninstall fails. Multiple users confirm this.   [Microsoft Learn](https://learn.microsoft.com/en-us/answers/questions/5900328/pc-app-store-infection)

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## **Before you proceed — one question for you**
**Can you reach Safe Mode on that machine?**  
If not, I’ll give you the exact key combination for that motherboard/brand to force Safe Mode.