Sounds like you have a lot of problems with your computer right now, so I'm gonna start by asking you to put down that hammer...we've all been there, but it's not the answer.
MS Paint should be located at "c:\windows\system32\mspaint.exe". If it's not, try running "System Restore" and return your computer to a state where it worked properly. If you haven't created a restore point, or it does not correct the problem, your computer manufacturer should have included a backup of all programs/drivers. Check the start menu for an application recovery or software repair wizard. If there isn't, insert your installation/recovery CD and look for a recovery option that doesn't involve erasing all of your data/programs. The location and functionality of these features vary by vendor, but shouldn't be hard to find.
As for the long boot time, there are a few possibilities:
1. You probably have a lot of unnecessary programs launching at start-up. (Usually evidenced by a lot of icons in the taskbar.) Go Start, Run, and type in "msconfig". Click on the "startup" tab, scan through, and uncheck any programs that you don't want launched at startup. I've found that Answers That Work is very helpful in identifying unknown programs, as well as whether or not they are required.
2. Since you just reinstalled Windows, you shouldn't have a problem with viruses or spyware, but it's still a possibility. If you havn't already, install a virus scanner and firewall from McAfee, Norton, TrendMicro, or ZoneAlarm. McAfee offers a free virus scan. I also recommend installing Microsoft AntiSpyware. It may be a BETA, but it's already better than its alternatives, and Microsoft recently announced that the full version will be free when it comes out this summer.
Finally, the phrase "someone installed in my computer," followed by a problem, is never a good thing to hear. I'd restrict the ability of others to do that by password-protecting your account and disabling the "guest" feature. Then create new user accounts with "limited access" so that you can control who uses your computer, and what they do with it. Just go the "user accounts" from the control panel to prevent your computer from becoming a public playground.
Hope this helps,
I need help in loading the program MS Paint that was included in my Win XP SP2 Home Edition. Due to conflicts to a webCam someone installed in my computer, many programs were disconfigured and in desperation I re-installed again WIN XP but do not find this program. I also have MSN Dial-up 9 but could not find it there either. I need a lot of help, as my computer is new, but it takes like 5 minutes (yes, minutes) to boot. I uninstalled (physically removed this WebCam) but not the drivers that came with it, as the CD that accompanied the installation was lost and never found. I do not know what to do and appreciate very much any suggestion