right click on the "My Computer" icon on your desktop and then select "System Restore" ... if your System Restore is still enabled (by default) --- you should be able to revert the system to the state it was before you so enjoyed removing the PUPs ... this might cause the system to not know of apps you put in after that date so you might have to reinstall those as required ...

to do a system restore, select Programs-->Accessories-->System Tools-->System Restore then just work with the wizard ...

if not possible, reinstalling the OS might be your only option ...

good luck!