when my laptop is off and i switch it back on, it takes 50 minutes to become fully functional. i had it repaired in february because of viruses etc, or so i thought. this problem only started about 3 weeks ago, i informed the shop that repaired it and they said the gaurantee was only for 3 months. incidently they installed a security system called AVAST, i was wondering could this be the problem, as there have been other niggly problems since it was installed
do you have any real evidence that this problem is connected with the previous repair. If not then forget it. Avast is a well respected security program so is unlikely to have caused the problem. If you feel it is then disable or uninstall it and see if it does solve the problem. If not then reinstall as soon as possible. If yes then try another security program. There are several around ie AVG, Avira etc.
Try booting in "Safe Mode" (Tap F8 when you start the boot). This boots with a basic set of drivers.
If it boots OK my first line of attack would be to go into msconfig and untick all the start up programs and see if that helps. If it does then re-enable each one individually until you find which one is causing the problem.