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boot issue Win7 .. first was aswrvrt.sys and then CLASSPNP.SYS. need help

Joined
May 31, 2014
Messages
75 (0.02/day)
System Name AliveHunter
Processor AMD FX(tm)-6300 Six-Core Processor
Motherboard ASUS M5A97 R2.0
Cooling Cooler Master Hyper 212X
Memory G.Skill DDR3: F3-12800CL9-4GBXL [X2]
Video Card(s) ATI Radeon R9 270X, 2GB DDR5
Storage WD BLACK 2 TB + 1TB WD Portable USB3.0
Display(s) DELL S2240L
Case Cooler Master: K380 + 2 x 120mm Fan : Deepcool
Power Supply Antech VP550P V2
Software Microsoft Windows 7 (6.1) Ultimate Edition 64-bit Service Pack 1 (Build 7601)
My config:
ASUS MOBO: Asus M5A97 (2 yrs old)
CPU: FX6300 AMD
HDD: WD 1TB Blue (6 months old)
RAM : 2 x 1 Ripjaw Gskill 4 Gb DDR 3 (1 2 yrs old + 1 6 months old)
GPU: HD 5760 1GB DDR5 (3 yrs old)
Win 7 64bit

ISSUE:
10 days back I have updated AVAST free anitivirus to latest 2015 Program.
after a week of usage of my system, suddenly my system in between started running very .. even a simple right click will take 2 mins of time.
and then the system would hang while booting win7.
I tried booting in Safe mode.. but it would get stuck while loding file "aswrvrt.sys"
So a bit of internet search gave me a hint that Avast might be the culpurit.

tried booting in safe mode a number of times .. but the problem ..
Then i left the system undisturbed while booting for about 30 mins...
after 30 mins or so the system started in safe mode.. initially it was working slow .. but then it was working fine.
so i somehow uninstalled Avast and rebooted the system.

Now it would get stuck at "CLASSPNP.SYS".

looking at this .. i formatted my C: and reinstalled windows 7.. and only installed Lan Drivers so that I could connect to internet.

After this i restarted my system once and it worked the whole day (16 hrs) perfectly fine.
then in the eveining i restarted the system ...

and again the same issue .. it got stuck windows boot screen.. i tried in safe mode.. to get stuck at "CLASSPNP.SYS".

Initially i thought it could be HDD failure issue .. but now i am clueless..

request some suggestion.
 
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