Worm:Win32/Ainslot.A

Use the following free Microsoft software to detect and remove this threat:

You should also run a full scan. A full scan might find other hidden malware.

Disable Autorun

This threat tries to use the Windows Autorun function to spread via removable drives, like USB flash drives. You can disable Autorun to prevent worms from spreading:

Scan removable drives

Remember to scan any removable or portable drives. If you have Microsoft security software, see this topic on our software help page:

Remove program exceptions in the firewall

This threat might add itself to your Windows Firewall exception list. This means it can go online without being blocked. To remove it from the exception list, do the following:

For Windows 8:

1. Open Windows Firewall by swiping in from the right edge of the screen, tapping Search (or if you're using a mouse, pointing to the upper-right corner of the screen, moving the mouse pointer down, and then clicking Search), entering firewall in the search box, tapping or clicking Settings, and then tapping or clicking Windows Firewall.
2. In the left pane, tap or click Allow an app or feature through Windows Firewall.
3. Tap or click Change settings. You might be asked for an admin password or to confirm your choice.
4. Select the check box next to the app you want to allow, select the network types you want to allow communication on, and then click OK.

For Windows 7:

1. Click Start, select Control Panel, then System and Security.
2. Select Windows Firewall.
3. On the menu on the left, select Allow a program through Windows Firewall. If you're prompted, type the password or provide confirmation.
4. Click Change Settings. If you're prompted, type the password or provide confirmation.
5. Select <program name> from the list of allowed programs and features. Click Remove.
6. Click OK.

For Windows Vista:

1. Click Start, select Control Panel, then Security Center.
2. On the menu on the left, select Windows Firewall.
3. On the menu on the left, select Allow a program through Windows Firewall. If you are prompted, type the password or provide confirmation.
4. Select <program name> from the list of allowed programs and features. Click Delete.
5. Click OK.

For Windows XP:

1. Use an administrator account to log on.
2. Click Start, select Run, type wscui.cpl, and then click OK.
3. In Windows Security Center, click Windows Firewall.
4. On the Exceptions

Get more help

You can also visit our advanced troubleshooting page or search the Microsoft virus and malware community for more help.

If you’re using Windows XP, see our Windows XP end of support page.