Try This......

Try the smart defrag in this website

www.iobit.com
It is very effective also.

Problem to solve folder options
Thats not an Trojan horse its an I-Worm.Ray Virus it can be easily removed through Quick heal and once it is removed u can once again bring back ur folder option by doing the following thing
Open - Run - gpedit.msc-ADMINISTRATIVE TEMPLATES- WINOWS- FOLDER OPTION CLICK ENABLE
Orkut Banned Removal
Removal procedure for orkut, firefox, youtube virus
when u r system effected, it show following messages when u open
firfox-I DNT HATE MOZILLA BUT USE IE OR ELSE...
orkut- Orkut is banned you fool, The administrators didnt write this program guess who did?? MUHAHAHA!!
To remove this do the following things
                                                               
1.goto taskmanager-->processes find svchost.exe under your username (warning not a svchost.exe under system as username) end or kill these processes by pressing endprocess
2.now goto your "c" drive(where you installed your windows) then type "c:\heap41a" in address bar...(or delete through command prompt)
3. delete all the contents of the "c:\heap41a" folder
4.now open register editor by running "regedit" in run command menu( start-->run )
5.goto "edit" then "find" search for "heap41a" delete that key like "C:\heap41a\svchost.exe C:\heap(some number)\std.txt"
6.now close register editor
7. restart pc
Ultimate Solution for this problem
Even i had the same problem. just follow the following steps, the
worm will be deleted forever:

1.Press CTRL+ALT+DEL and go to the processes tab

2.Look for svchost.exe under the image name. There will be many but
look for the ones which have your username under the username

3.Press DEL to kill these files. It will give you a warning, Press
Yes

4.Repeat for more svchost.exe files with your username and repeat. Do
not kill svchost.exe with system, local service or network service!

5.Now open My Computer

6.In the address bar, type "C:\heap41a" and press enter

7.Delete all the files here

8.Now go to start -> Run and type "Regedit"

9.Go to the menu EDIT --> FIND

10.Type "heap41a" here and press enter

11.You will get something like this "[winlogon]
C:\heap41a\svchost.exe
C:\heap(some number)\std.txt"

12.Press DEL. It will ask "Are you sure you wanna delete this value",
click "Yes"

13.Now close the registry editor

BANG! Virus is Gone!

Note: Please format all your pen drives because the virus is in that
hidden in an microsoft.exe autorun.inf which you might not find. Else
you might have to repeat all this everytime!