pqstv.bak1 is a malicious file, which belongs to VirtueMonde, ErrorSafe, Celldorado and other dangerous programs. Please, do NOT leave these programs on your computer because they can not only damage your computer or initiate serious problems on it. These programs may also try to steal your personal information, such as banking data, loggins and passwords. If you noticed pqstv.bak1 in your system, you should immediately scan it with reputable anti-spyware. Our recommended program is Reimage.
As soon as any of previously mentioned viruses infects computer, it creates pqstv.bak1 and other malicious files. These files are mostly used for degrading system's performance. pqstv.bak1 can be used for showing fake alerts, redirecting people to malicious websites, infecting system with other malicious files and even violating victim's privacy. To sum up, pqstv.bak1 appearance reveals the fact that your PC is infected. In this case, you should examine this file with RegCure Pro and then remove it from your computer.