I'm new here so don't know if I'm posting in the right place or even if I have a problem. So perhaps some kind person will set me right.
The Laptop I am concerned about runs Vista Home Edition and for security I was using Superantispyware Professional and Microsoft Security Essentials (MSE). Recently MSE stopped working. I was invited to restart it but was unable to do so. I was also unable to uninstall in order to reinstall even though I followed Microsoft's own intructions. Worried that an infection might have disabled my virus protection I iperformed a full Superantispyeware scan. Result only the usual tracking cookies. I then installed Avast free edition because I had no virus protection. When I tried to scan with Avast it started but soon hung and froze. It did this twice.The only way I could perform the scan was to go into Safe Mode. The scan showed one infection "Java:Agent-CLW[Expl]". I removed this with Avast.
The computer is now running ok but I still cannot restart Microsoft Security Essentials.
Do I have something to worry about and what should I do about it?
Would someone be kind enough to advise please?