You already asked here, there’s no need to open another thread. But again you don’t give any information, so of course nobody can help. It’s like somebody asking a doctor “My leg hurts, what should I do?”. More information is stringently required. At least:
What’s your operating system?
What hardware do you use exactly (soundcard, audio interface, whatever)?
Which VST versions do you use exactly (system, 32/64bit, VST2/3, whatever)?
What exactly happened when exactly after installing these VSTs?
Good luck!