Did AVG provide a specific file(s) name associated with the malware threat(s) detected and if so, where is it located (full file path) at on your system?
AVG provides this description on their web site
Win/Patched is a malicious software that once it is executed has the capability of replicating itself and infect other files and programs. These type of malware, called Viruses, can steal hard disk space and memory that slows down or completely halts your PC. It can also corrupt or delete data, erase your hard drive, steal personal information, hijack your screen and spam your contacts to spread itself to other users. Usually, a Virus is received as an attachment on an email or instant message.
detections are usually legitimate (critical) Windows components that have been infected by a malicious application. Malware can add parts of its code to a system component and then patch certain functions of the original file to point to an appended code. In some cases a patched detection can be indicative of a dangerous polymorphic file infector
functionality. The difference between file infectors (viruses) and patches is that a patch just changes a few bytes and cannot spread themselves. File infectors infect (patch) the victim file and add a virus body to perform a malicious action and can infect hundreds of other files.
You should get a second opinion for this type of detection. Try performing an Online Virus Scan
such as Eset Online Anti-virus Scanner
to see if it can provide more specifics about the detected threat without allowing removal.