Having wierd problems with my PC after installing crap programs

[Morpheus]

Hi. On the last day of the ME of WSOP, I installed all kinds of crap on my PC. Now my PC is acting funny. I close down apps and they don't shut down completely and are still open when I look at Task Manager so when I go to open the app again , it tells me that a user is already using it. This has happened with two apps so far. Firefox and IE. While I was on one of the poker sites, (gutshot.com), I was trying to install the new Java and all of a sudden one of the security certificates came up and it asked me if I wanted to install Macromedia Flash 7 but I had no idea why it was asking me this but I said "yes" and it said "system settings have been changed" please restart PC. I was like "oh crap" . I think this was the problem. Should I do a system restore to day before WSOP ? I think I can. What day was the last day of the ME ? Was it Fri or Sat ?