So you have an administrative command line, and you want to run the uninstaller of all msiexec-installed items whose names start with PQ. Here’s how:
wmic product where "name like 'PQ%'" call uninstall /nointeractive
If you wanted to run the uninstaller for everything with PQRST anywhere in its name, a double wildcard works too:
wmic product where "name like '%PQRST%'" call uninstall /nointeractive