Uninstaller does not work

Uninstaller on my system has stopped working.It doesnt allow me to uninstall anything.I actually wanted to uninstall my earlier version of my anti spyware software and install a new one but the system does not allow me to do so.When I did that It said "supersetup unistaller has stopped working".
My google chrome does not start ,it says
"google chrome has stopped working" with details as follows
Problem signature:
Problem Event Name: BEX
Application Name: chrome.exe
Application Version: 0.0.0.0
Application Timestamp: 4e5c7495
Fault Module Name: StackHash_36ea
Fault Module Version: 0.0.0.0
Fault Module Timestamp: 00000000
Exception Offset: de17d866
Exception Code: c0000005
Exception Data: 00000008
OS Version: 6.0.6000.2.0.0.256.1
Locale ID: 1033
Additional Information 1: 36ea
Additional Information 2: 6cbd4ab6303e6ea1fe5b79843226fb87
Additional Information 3: 4e3b
Additional Information 4: 7550cc460fb9cbe1f1fe3f65293cd4d2

same thing is happening with mozilla.
I did some reading on this forum.It said it could be due to some registery problems.I downloaded a free registery booster
,did a scan and fixed the errors. But its still not working.

sometimes it says it has turned off a particular program because of DEP.I did some R n D there also but it didnt help.

any help would be highly appreciated ..

Welcome
Run a full antivirus scan
Download and run a full scan with malwarebytes.
If both are negative, try to go back to good times with System Restore.
http://www.vistax64.com/tutorials/76905-system-restore-how.html