Hi and welcome to GeeksToGo! My name is Sam and I will be helping you.
This is not much information to go on, but we'll give a go and see what can be done.
First let's see if we can restore your computer to an earlier time when things worked a little bit better.
Reboot into Safe mode.
Click Start -> All Programs -> Accessories -> System Tools -> System Restore.
Select "Restore my computer to an earlier time" and click Next.
Now you will see a calendar. Any date in bold contains a restore point. Select one when your computer would boot up normally and click Next.
Click Next again to begin the restore process.
Sometimes you get a message after rebooting that the restore could not be completed. Don't get too frustrated by this, just run through the process again and try another date.
Even if you are able to restore successfully we will likely still have some problems to deal with. Let me know how it goes.