Running multiple antivirus programs concurrently can degrade performance and create conflicts.[37] However, using a concept called multiscanning, several companies (including G Data[38] and Microsoft[39]) have created applications which can run multiple engines concurrently.
It is sometimes necessary to temporarily disable virus protection when installing major updates such as Windows Service Packs or updating graphics card drivers.[40] Active antivirus protection may partially or completely prevent the installation of a major update.
The functionality of a few software programs can be hampered by active anti-virus software. For example TrueCrypt, a disk encryption program, states on its troubleshooting page that anti-virus programs can conflict with TrueCrypt and cause it to malfunction or operate very slowly.[41]
Support issues also exist around antivirus application interoperability with common solutions like SSL VPN remote access and network access control products.[42] These technology solutions often have policy assessment applications which require that an up to date antivirus is installed and running. If the antivirus application is not recognized by the policy assessment, whether because the antivirus application has been updated or because it is not part of the policy assessment library, the user will be unable to connect.
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