Not booting into Safe-Mode is a bad sign.
We should try to fix it:
.....here are the possible, good steps to solve the problem:
1. Check ALL partitions for errors, marking "auto-fix along the scan" option. Reboot, wait for all of the scans to complete.
2. Using Ashampoo WinOptimizer 2012 FREE EDITION for Windows XP and up, take your operating system back to defaults, following these steps:
...OS Tweeaks, this is what you'll need to select; open it and drop your system to all of the security-important defaults. Hit apply and reboot.
3. Using CCleaner, perform all the scans, which are File Cleans and Registry orphaned entries cleans.
4. After these cleaning operations, place a hard fair System Restore point on that date.
...use from now on! :-)
...you can also perform a defrag for a faster file accesses.
P.S. Ashampoo has, also, an internet tuning module, which strains an internet connecting options to maximum, with a gain of aprox. 5-10% of internet speed; mainly about modern browser settings.