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Tried chkdsk /r again - this is what I got. Next I ran diskpart and cleared the write protection on C drive

Using the command prompt I have tried chkdsk /r but it says the disc is write protected. Recovery options using the windows installation disk gave me an error I was using a version of recovery tools that was not compatible with my version of Windows. Problem details from the failed startup repair - OsVersionMismatch. From the Avast menu, select Protection > Virus Scans.After running a Avast boot time scan on a Aspire 7530 running Windows 7, the laptop is stuck in a startup repair loop which cant be fixed. Once installed, open the Avast UI by selecting the Avast icon on the taskbar. To start, you’ll need to download and install Avast on a non-infected PC (or, if that isn’t possible, on your infected PC if your PC still boots).All major antivirus providers support this feature, including the free-to-use Avast Antivirus, although alternatives to Avast are available and are perfectly suitable. While Microsoft Defender is a suitable built-in antivirus for Windows 10 users, you can also use third-party antivirus tools to perform an offline virus scan of your PC. Running an Offline Virus Scan Using Third-Party Antivirus Software Make sure to remove your USB drive or DVD at this point and restore the correct boot order in your BIOS or UEFI settings to ensure that Windows will correctly boot up afterwards. Once the process is finished, your PC will reboot and the malware should be removed. If Windows Defender tool can run on your version of Windows 10, however, follow the on-screen instructions to scan your PC and deal with any infected files.

Once the file is downloaded, run the tool and select Next.

If it doesn’t work, you may need to use a third-party antivirus as an alternative, or schedule a Microsoft Defender Offline scan in Safe Mode using the steps above instead.Ĭreating the Windows Defender Offline Tool USB or DVD Media However, the tool itself is outdated (although the virus definitions are up-to-date) and won’t work with newer versions of Windows.įor this reason, this tool should only be used on older PCs running an older version of Windows 10 (or an earlier version of Windows). While this portable version of Defender was originally made for Windows 7 and 8.1, it can still be used to scan for malware on some Windows 10 PCs, depending on the version. While Windows 10 allows you to conduct an offline virus scan using Microsoft Defender without any additional tools or hardware, you can also use the older Windows Defender Offline tool on a portable USB drive or DVD to conduct a boot-level scan when Windows can’t (or shouldn’t) boot. Using the Older Windows Defender Offline Tool to Scan for Malware (Older Versions of Windows)